Acum il inlocuim pe a (care estre egal cu 8*b+35) in prima ecuatie asa: [tex] \left \{ {{a-b=328} \atop {b*8+35=a}} \right. =\ \textgreater \ 8b+35-b=308=\ \textgreater \ \\=\ \textgreater \ 7b=273=\ \textgreater \ b=39[/tex] . Si daca [tex]b=39=\ \textgreater \ a-39=308=\ \textgreater \ a=347[/tex]