Ответ:

а)

х=4

б)

х=-9

в)

х=-11

д)

-3х+7=31

-3х=31-7

х=24:-3

х=-8

з)8х+20=х-1

8х-х=-1-20

7х=-21

х=-3

и)-8х+2=-3х+32

-8х+3х=32-2

-5х=30

х=30:-5

х=-6

л)6(4х+3)-9=3(6х-9)=

24х+18-9=18x-27

24х-18х-9=-27-18

6х=-45+9

6х=-36

х=-36:6

х=-6