218-(x+31)=x-29
218-x-31=x-29
(218-31)-x=x-29
187-x=x-29 -x=x-29-187 -2x=-158 x=-158/-2 x=79218 - (x +31) = x - 29
218 - x -31 = x - 29
(218 - 31) - x = x - 29
187 - x = x - 29 - x = x - 29 -187 - 2x = -158x = -158x-2x = 79
218 - (x + 31) = x - 29
218-(x + 31) =-(x - 187)
-(x - 187)= x - 29
187 - x= x - 29
-2x=-216
x=108