2(x+15)=x-10 2x+30=x-10 x=-40
4（x+7)=2(x-1) 4x+28=2x-2 2x=-30 x=-15
-7( x+1)=21 x+1=-3 x=-4
6(x-0.5)-x=12 6x-3-x=12 5x=15 x=3