ing the substitution 
        <p class="programlistingindent"><img src="../../../../fig/mpt/modules/solvers/mpt_call_lcp58.png" alt="../../../../fig/mpt/modules/solvers/mpt_call_lcp58.png"></p>
        the system <img src="../../../../fig/mpt/modules/solvers/mpt_call_lcp26.png" alt="../../../../fig/mpt/modules/solvers/mpt_call_lcp26.png"> can be rewritten in variable <img src="../../../../fig/mpt/modules/solvers/mpt_call_lcp27.png" alt="../../../../fig/mpt/modules/solvers/mpt_call_lcp27.png">
        
     