1)8y-3(2y-3)=7y-2(5y+8)
8y-6y+9=7y-10y-16
8y-6y-7y+10y=-16-9
5y=-25
y=-25:5
y=-5
2)5(2y-9)+6y=4(3y-2)-21
10y-45+6y=12y-8-21
10y+6y-12y=-8-21+45
4y=16
y=4
3)5y+7(3-y)=3(5-2y)-6
5y+21-7y=15-6y-6
5y-7y+6y=-21+15-6
4y=-12
y=-3
4)7y-4(3y+5)=2-3(4y-9)
7y-12y-20=2-12y+27
7y-12y+12y=20+2+27
7y=49
y=7