-115-(17+2x)=20
=>\(2x+17=-115-20=-135\)
=>\(2x=-135-17=-152\)
=>\(x=-\dfrac{152}{2}=-76\)
\(-115-\left(17+2x\right)=20\)
\(=>17+2x=\left(-115\right)-20\)
\(=>17+2x=-135\)
\(=>2x=\left(-135\right)-17\)
\(=>2x=-152\)
\(=>x=\left(-152\right):2\)
\(=>x=-76\)