bonsoir;

a. 6x +9=39

6x= 39-9

6x =30

x=30/6

x=5

b. -4x+22= 12

22-12 = 4x

10=4x

x = 10/4

x=2,5

c. 3x - 13 = -34

3x= -34+13

3x = -21

x=-21/3

x= -7

d. -9x+44 = 116

44-116 = 9x

-72 = 9x

x =-72/9

x = -8

e. 20x +36=31​

20x= 31-36

20x = -5

x = -5/20

x= -2,5