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          <e type="operand">14</e>
          <e type="operand" style="unit">F</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">x</e>
          <e type="function" args="2">solve</e>
          <e type="function" args="1">maple</e>
        </input>
        <result action="numeric">
          <e type="operand">7</e>
          <e type="operand" style="unit">F</e>
          <e type="operator" args="2">*</e>
        </result>
      </math>
    </region>
    <region left="27" top="783" width="279" height="28" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">2</e>
          <e type="operand" style="unit">F</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">20</e>
          <e type="operand" style="unit">F</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">x</e>
          <e type="function" args="2">solve</e>
          <e type="function" args="1">maple</e>
        </input>
        <result action="numeric">
          <e type="operand">18</e>
          <e type="operand" style="unit">F</e>
          <e type="operator" args="2">*</e>
        </result>
      </math>
    </region>
    <region left="27" top="810" width="367" height="28" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">8</e>
          <e type="operand" style="unit">tonne</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">16</e>
          <e type="operand" style="unit">tonne</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">x</e>
          <e type="function" args="2">solve</e>
          <e type="function" args="1">maple</e>
        </input>
        <result action="numeric">
          <e type="operand">8000</e>
          <e type="operand" style="unit">kg</e>
          <e type="operator" args="2">*</e>
        </result>
      </math>
    </region>
    <region left="27" top="837" width="375" height="28" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">12</e>
          <e type="operand" style="unit">tonne</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">21</e>
          <e type="operand" style="unit">tonne</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">x</e>
          <e type="function" args="2">solve</e>
          <e type="function" args="1">maple</e>
        </input>
        <result action="numeric">
          <e type="operand">9000</e>
          <e type="operand" style="unit">kg</e>
          <e type="operator" args="2">*</e>
        </result>
      </math>
    </region>
    <region left="27" top="864" width="309" height="37" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">5</e>
          <e type="operand" style="unit">m</e>
          <e type="operand">3</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">45</e>
          <e type="operand" style="unit">m</e>
          <e type="operand">3</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">x</e>
          <e type="function" args="2">solve</e>
          <e type="function" args="1">maple</e>
        </input>
        <result action="numeric">
          <e type="operand">40</e>
          <e type="operand" style="unit">m</e>
          <e type="operand">3</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
        </result>
      </math>
    </region>
    <region left="27" top="900" width="321" height="37" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">15</e>
          <e type="operand" style="unit">m</e>
          <e type="operand">3</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">10</e>
          <e type="operand" style="unit">m</e>
          <e type="operand">3</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">x</e>
          <e type="function" args="2">solve</e>
          <e type="function" args="1">maple</e>
        </input>
        <result action="numeric">
          <e type="operand">5</e>
          <e type="operand" style="unit">m</e>
          <e type="operand">3</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="1">-</e>
        </result>
      </math>
    </region>
  </regions>
</worksheet>