bonjour merci aux personnes qui vont prendre de leurs temps

Explications étape par étape:

a)

4x + (3x-1) - 3 = 8x - 2x + 4

7x - 4 = 6x + 4

7x - 6x = 8

x = 8

b)

5x - (x - 4) = 20

5x - x + 4 = 20

4x = 20 - 4 = 16

x = 4

c)

3 - (8x + 1) = 2x - 4

2 - 8x = 2x - 4

2 + 4 = 2x +8x

6 = 10x

x = 3/5

d)

(x - 2) + (-x - 4) = 5x + (-2x + 16)

-6 = 3x + 16

3x = - 16 - 6 = - 22

x = - 22/3