a)2(x+1)=8
2x+2=8
2x=8-2
2x=6/2
x=3
b) 3(x-2)=2x+5
3x-6=2x+5
3x-2x=5+6
x=11
c)5(2x-4)=3(4x+2)
10x-20=12x+6
10x-12x=6+20
-2x=26/·(-1)
2x=-26/2
x= -13
d)x-2(x+1)=2x
x-2x-2=2x
x=2
ETC
