Simulink 'Algebraic Constraint block '

I am trying to solve a system of non-linear algebraic equations in Simulink environment and i end up using the Algebraic Constraint block for a number of equations with the equations coded in m. functions boxes.

Since, most of the system equations are 2nd polynomials, i would like to ask you how is it possible to choose (or constraint) the one of both solutions that each of them has. I would be interested in choosing the maximum of them.

Any other solutions are welcome.

Thank you in advance.