m11m 1) 8х+12=5х+3
8х-5х=3-12
3х=-9
х=-3

2) 3(2х+1)+7=4
6х+3+7=4
6х=4-10
6х=-6
х=-1

3) 6+3(5х-7)=4х+7
6+15х-21=4х+7
15х-4х=7+15
11х=22
х=2

4) 3(7х-4)-4(6х+5)=х
21х-12-24х-20=х
-3х-х=32
-4х=32
х=-8

5) 3х-5(2х+3)-6(5х-4)=-28
3х-10х-15-30х+24=-28
-37х=-28-9
-37х=-37
х=1