Ответ:

1)

2+3х=-7х-5

3х+7х=-5-2

10х=-7

х=-0,7

2)

7+8х=-2х-5

8х+2х=-5-7

10х=-12

х=-1,2

3)

-7-2х=-6х+10

-2х+6х=10+7

4х=17

х=4/17

4)

-1-3х=2х+1

-3х-2х=1+1

-5х=2

х=-2/5

5)

8-5(2х-3)=13-6х

-10х+6х=13-8-15

-4х=-20

х=5

6)

1-7(4+2х)=-9-4х

-14х-4х=-9-1+28

-28х=18

х=-18/28