bonjour quelqu'un peut m'aider pour cette exercice merci d'avance EXERCICE : A. 5 (x+3) = 3 + (2x-6) B. x+3 - 4x-1 = 3 + x ------ ------- ----

Bonjour,

A. 5 (x+3) = 3 + (2x-6)

5x + 15 = 3 + 2x - 6

5x - 2x = - 6 - 15

3x = - 21

x = - 21/3

x = - 7

B. (x + 3) / 3 - (4x - 1) / 6 = (3 + x) / 3

(2x + 6) / 6 - (4x - 1) / 6 = (6 + 2x) / 6

2x + 6 - 4x + 1 = 6 + 2x

2x - 4x - 2x = 6 - 6 - 1

- 4x = - 1

x = 1/4

C. -2 (2x-4) = 6x - (-3+x)

- 4x + 8 = 6x + 3 - x

- 4x - 6x + x = 3 - 8

- 9x = - 5

x = 5/9

D. 4x - 2 + (5x-1) = -3 (7-x)

4x - 2 + 5x - 1 = - 21 + 3x

4x + 5x - 3x = - 21 + 2 + 1

6x = - 18

x = - 18/6

x = - 3.

E. (x + 5) / 2 - (2x - 7) / 5 = (2 + 3x) / 10

(5x + 25) / 10 - (4x - 14) / 10 = (2 + 3x) / 10

5x + 25 - 4x + 14 = 2 + 3x

5x - 4x - 3x = 2 - 25 - 14

- 2x = - 37

x = 37/2.