1. 2х+1/7 =0

2х= -1/7

х=-1/14

2. 0,1 - 1/2х = 1/5

1/10 - 1/2х = 1/5

1-5х = 2

-5х = 2-1

-5х= 1

-х= -1/5

3. 10 - 2х + 7 = 7-4х

10-2х= -4х

-2х + 4х = -10

2х=-10

х=-5

4. 6-8(1/4-х)=5+3х

6-2+8х= 5+3х

4+8х=5+3х

8х-3х=5-4

х=1/5

5. 2/3х-13/5+1/5х=0

10х-39+3х=0

13х=39

х=3