Question

1)7(x+3)+8(x+4)=15(x+6)
2)3(y-5)+5(6-2y)=-7(y+3)
3) 9(2x+2)+4(x-7)-2(11x-9)=0

Answer 1

1)7х+21+8х+32=15х+90
7х+8х-15х=-21-32+90
0=37
2)3у-15+30-10у=-7у-21
3у-10у+7у=-21+15-30
0=-36
3)18х+18+4х-28-22х+18=0
18х+4х-22х=-18+28-18
0=-8