Verified answer

Bonsoir;

3x +15 = 60

3x  = 60-15

3x = 45

x = 45/3

x = 15

b)x - 21 = 49

x = 49+21

x = 70

d) 5 (4x-7)= 65

20x -35 = 65

20x = 65-35

20x = 30

x = 30/20

x = 3/2

x = 1,5

e) 4x - 11 = 8x - 25

-11+25 = 8x -4x

14 = 4x

x = 14/4

x = 3,5

(c) 2 (4-3x) = 26

8-6x =26

8-26 = 6x

-18 = 6x

x = -18/6

x = -3

5x +31 = 2x + 64.

5x - 2x = 64-31

3x = 33

x = 33/3

x =11