4х=-8+3ух=-(8+3у):4
-3(8+3у):4-4у=-13(-24+3у):4+13=4у4у=(28+3у):413у=28у=28:13
9+2х=12-х
1) (a+3)*6=12
a+3= 2
a= -1
2) при a= -3