a) \(\left(x-35\right)-120=0\)
\(x-35=0+120\)
\(x-35=120\)
\(x=120+35\)
\(x=155\)
b) \(156.\left(x+61\right)=82\)
\(x+61=82:156\)
\(x+61=\frac{41}{78}\)
\(x=\frac{41}{78}-61\)
\(x=-\frac{4717}{78}\)
c) \(124+\left(118-x\right)=217\)
\(118-x=217-124\)
\(118-x=93\)
\(x=118-93\)
\(x=25\)