Question

Найдите корень уровнения
1)5(х-4)=х+8
2)9-7(х+3)=5-6х
3)(7х+9)-(11х-7)=8

Answer 1

1) 5(х-4)=х+8
5х-20=х+8
4х=28
х=7

2) 9-7(х+3)=5-6х
9-7х-21=5-6х
-17=х

3) (7х+9)-(11х-7)=8
7х+9-11х+7=8
-4х=-8
х=2