I intend to solve two or more nonlinear implicit equations with complex coefficients. Is there any algoritm implemented in SMath?

Best regards,
Mustafa

Perhaps you can use Solve() from the Maxima plugin (this is pre-installed in the portable distribution (see signature). There is an interactive handbook ([?]-Button in the toolbar) with a chapter Mathematics and several pages on equation solving. You also can try the function index and locate the entry for Solve().