b) -8x = -7 c) 3x -7 = -15 d) 5x +7=3x - 19 e) 3(x-2)-(2-5x) = 4 -6(2-3x)-7x Developper et reduire chacun des membres de cette equation = pour lequation (e) Rés

Bonjour

b) -8x = -7

x = 7/8

c) 3x -7 = -15

3x = - 15 + 7

3x = - 8

x = - 8/3

d) 5x +7=3x - 19

5x - 3x = 19 - 7

2x = 12

x = 12/2

x = 6

e) 3(x-2)-(2-5x) = 4 -6(2-3x)-7x

3x - 6 - 2 + 5x = 4 - 12 + 18x - 7x

3x + 5x - 18x + 7x = 4 - 12 + 6 + 2

- 3x = 0

x = 0.

Réponse :

b) -8x = -7

x = -7/-8 = 7/8

c) 3x -7 = -15

3x = -8

x = -8/3

d) 5x + 7 = 3x - 19

2x + 7 = -19

2x =  -26

x = -26/2 = -13

e) 3(x - 2) - (2 - 5x) = 4 - 6(2 - 3x) - 7x

3*x + 3*(-2) - 2 + 5x = 4 - 6*2 - 6*(-3x) - 7x

3x - 6 - 2 + 5x = 4 - 12 + 18x - 7x

8x - 8 = 11x - 8

-3x - 8 = - 8

-3x = 0

x = 0/-3 = 0

j'espère t'avoir aidé !