[tex]35*5-54:a*4=139=\ \textgreater \ \\ 175- \frac{54}{a}*4=139=\ \textgreater \ \\ 175- \frac{216}{a} =139, a \neq 0=\ \textgreater \ \\ - \frac{216}{a} =139-175=\ \textgreater \ \\ - \frac{216}{a} =-36 =\ \textgreater \ \\ -216=-36a=\ \textgreater \ \\ -36a=-216=\ \textgreater \ \\ a=6, a \neq 0=\ \textgreater \ \\ S=[6] \\ Succes [/tex]
