Bonjour j'aurais besoin d'aide pour résoudre les équations. merci a. 3(x + 7) = 5x - 3 b. 2(7x + 1) = 3(- 2x + 4) c. 3x - 8 = 2(- 2x + 4) d. - 8(2x + 1) = 5(- 3

bonsoir

résoudre les équations

a. 3(x + 7) = 5x - 3

3x + 21 = 5x - 3

21 + 3 = 5x - 3x

24 = 2x

x = 24/2

x = 12

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

14x + 2 = -6x + 12

14x + 6x = 12 - 2

20x = 10

x = 10/20

x = 1/2

c. 3x - 8 = 2(- 2x + 4)

3x - 8 = -4x + 8

3x + 4x = 8 + 8

7x = 16

x = 16/7

d. - 8(2x + 1) = 5(- 3x + 4)

-16x - 8 = -15x + 20

-20 - 8 = 16x - 15x

-28 = x

x = -28

e. 2(x + 4) + 5(x + 2) = 4

2x + 8 + 5x + 10 = 4

7x = 4 - 18

7x = -14

x = -14/7

x = -2

f. - 3(x + 6) + 2(5x - 1) = 3x

-3x - 18 + 10x - 2 = 3x

10x - 6x = 18 + 2

4x = 20

x = 20/4

x = 5

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

21x - 14 - 3 = 10x - 20

21x - 10x = -20 + 17

11x = -3

x = -3/11

h. 6x + 2 = 3(8x - 1) - 3x

6x + 2 = 24x - 3 - 3x

2 + 3 = 21x - 6x

5 = 15x

x = 5/15

x = 1/3