2) 8x-(7x+8)=9
8x-7x-8-9=0
x-1=0
x=1
4) 4+8y+8=2y-(10+7y)+9
12+8y=2y-10-7y+9
12+8y-2y+10+7y-9=0
13-13y=0
-13y=-13
y=-1
2) 11(y-4)+10(5-3y)-3(4-3y)=-6
11y-44+50-30y-12+9y+6=0
10y=0
y=-10
4)
10(3x-2)-3(5x+2)+5(11-4x)=
25
30x-20-15x-6+55-20x-25=0
-5x-4=0
-5x=4
x=4/5