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    <math exponentialThreshold="4">
      <input>
        <e type="operand">L4</e>
        <e type="operand">8</e>
        <e type="operator" args="2">:</e>
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    <math exponentialThreshold="4">
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        <e type="operand">L5</e>
        <e type="operand">5</e>
        <e type="operator" args="2">:</e>
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      <input>
        <e type="operand">L6</e>
        <e type="operand">6</e>
        <e type="operator" args="2">:</e>
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        <e type="operand">a1</e>
        <e type="operand">1</e>
        <e type="operator" args="2">:</e>
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      <input>
        <e type="operand">b1</e>
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        <e type="operator" args="2">:</e>
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      <input>
        <e type="operand">c1</e>
        <e type="operand">0.25</e>
        <e type="operator" args="2">:</e>
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    <math>
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        <p>system of nonlinear equations</p>
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        <e type="operand">x</e>
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        <e type="operator" args="2">-</e>
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        <e type="operand">2</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operand">q3</e>
        <e type="operand">x</e>
        <e type="operand">3</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
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        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">-</e>
        <e type="operand">x</e>
        <e type="operand">4</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">1</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operand">x</e>
        <e type="operand">5</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
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        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">3</e>
        <e type="function" args="2">el</e>
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        <e type="bracket">(</e>
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        <e type="operator" args="2">+</e>
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        <e type="operator" args="2">-</e>
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        <e type="operand">1</e>
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      <input>
        <e type="operand">X0</e>
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        <e type="operand">2.0615</e>
        <e type="operand">1.5757</e>
        <e type="operand">1.3705</e>
        <e type="operand">6</e>
        <e type="operand">1</e>
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      <input>
        <e type="operand">result</e>
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      <result action="numeric">
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        <e type="operator" args="1">-</e>
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        <e type="operator" args="1">-</e>
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  <region id="38" left="0" top="1926" width="251" height="28" color="#000000" bgColor="#ffffff" fontSize="12">
    <text lang="rus">
      <p bold="true">4.System of 12 equations</p>
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  <region id="39" left="9" top="1962" width="54" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
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    <math>
      <input>
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        <e type="operator" args="2">:</e>
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      <input>
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    <math>
      <input>
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        <e type="operator" args="2">:</e>
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      <input>
        <e type="operand">G2</e>
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        <e type="operator" args="2">:</e>
      </input>
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      <input>
        <e type="operand">G3</e>
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        <e type="operator" args="2">:</e>
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      <input>
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        <e type="operator" args="2">:</e>
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        <e type="operator" args="2">:</e>
      </input>
    </math>
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      <input>
        <e type="operand">L2</e>
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        <e type="operator" args="2">:</e>
      </input>
    </math>
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  <region id="50" left="378" top="1989" width="70" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
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      <input>
        <e type="operand">L3</e>
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        <e type="operator" args="2">:</e>
      </input>
    </math>
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  <region id="51" left="468" top="1989" width="70" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">L4</e>
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        <e type="operator" args="2">:</e>
      </input>
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  <region id="52" left="558" top="1989" width="54" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">L5</e>
        <e type="operand">1</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
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  <region id="53" left="18" top="2070" width="413" height="399" color="#000000" bgColor="#ffffff" fontSize="10" showInputData="False">
    <math>
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        <p>system of nonlinear equations</p>
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        <e type="operand">x</e>
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        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
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        <e type="operand">D3</e>
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        <e type="bracket">(</e>
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        <e type="operand">L2</e>
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        <e type="operator" args="2">-</e>
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        <e type="operand">4</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">5</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="operand">0.5</e>
        <e type="operand">x</e>
        <e type="operand">6</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operand">2</e>
        <e type="operator" args="2">-</e>
        <e type="operand">x</e>
        <e type="operand">7</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">8</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="operand">0.5</e>
        <e type="operand">x</e>
        <e type="operand">9</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operand">2</e>
        <e type="operator" args="2">-</e>
        <e type="operand">x</e>
        <e type="operand">4</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">7</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operand">x</e>
        <e type="operand">5</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">8</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operand">x</e>
        <e type="operand">6</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">9</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operand">L2</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">-</e>
        <e type="operand">L3</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">-</e>
        <e type="operand">x</e>
        <e type="operand">1</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">+</e>
        <e type="operand">0.5</e>
        <e type="operand">x</e>
        <e type="operand">3</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">-</e>
        <e type="operand">4</e>
        <e type="operator" args="2">-</e>
        <e type="operand">G1</e>
        <e type="operand">x</e>
        <e type="operand">1</e>
        <e type="function" args="2">el</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
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  <region id="57" left="0" top="2880" width="632" height="28" color="#000000" bgColor="#ffffff" fontSize="12">
    <text lang="rus">
      <p bold="true">5.Cascade of Two Continuous Stirred-Tank  Reactors with Recycle</p>
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  </region>
  <region id="58" left="9" top="2925" width="751" height="72" color="#000000" bgColor="#ffffff" fontSize="10">
    <text lang="rus">
      <p>Consider a cascade of two continuous stirred-tank  reactors with recycle undergoing exothermic first-order chemical reactions. The steady state is described by four nonlinear equations for the reaction conversions  x1,x2 ,dimensionless temperature T1,T2 , and parameter α(Damköhler number).</p>
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