[tex]90.000-(42.586-l)=64.382[/tex][tex]=\ \textgreater \ 90.000-42.586=64.382-l\\
=\ \textgreater \ 47.414=64.382-l\\
=\ \textgreater \ l=64.382-47.414\\
=\ \textgreater \ 16.968\\\\
Proba:90.000-42.586=64.382-16.968\\
~~~~~~~~~~~~~~~~~~~~~~~~47.414=47.414[/tex]