-7х-7=4-8х

-7х+8х=4+7

х=11

9-4х=-9х-4

-4х+9х=-4-9

5х=-13

х=-13/5

х=-2 3/5

3-4х=-8х+9

-4х+8х=9-3

4х=6

х=6/4

х=1 1/2

2(х-7)=3

2х-14=3

2х=3+14

2х=17

х=17/2

х=8 1/2

5(х-9)=-2

5х-45=-2

5х=-2+45

5х=43

х=43/5

х=8 3/5