[tex] \left \{ {{a+b=42} \atop {a/b=5}} \right. \ \textless \ =\ \textgreater \ \left \{ {{5*b+b=42} \atop {a=5*b}} \right.\ \textless \ =\ \textgreater \ \left \{ {{6b=42} \atop {a=5b}} \right. \ \textless \ =\ \textgreater \ \left \{ {{b=42/6} \atop a=5b}} \right.\ \textless \ =\ \textgreater \ \left \{ {{b=7} \atop {a=35}} \right.[/tex] raspuns: a=35, b =7
