\(\left(-318\right)+133+217+318\)
\(=\left(-318+318\right)+\left(133+217\right)\)
\(=0+350=350\)
\(\left(-318\right)+133+217+318=\left(-318+318\right)+\left(133+217\right)=350.\)
\(=\left[\left(-318\right)+318\right]+\left(133+217\right)\\ =0+350=350\)