1)5x=2x-1,
2)4x+21=2x
3),8x+2=4x-2
4)2x+6=17x-9

Ответ:

1)5х=2х-1

5х-2х=-1

3х=-1

х=-1/3

2)4х+21=2х

4х-2х=-21

2х=-21

х=-21/2

х=-10 1/2

х=-10,5

3)8х+2=4х-2

8х-4х=-2-2

4х=-4

х=-4/4

х=-1

3)2х+6=17х-9

2х-17х=-9-6

-15х=-15

х=-15/-15

х=1