Pouvez vous m'aider svp :-) Il me demande de rédiger.

Bonjour,

-7x = 4

-7x/-7 = 4/-7

x = -4/7

5x + 27 = 14

5x + 27 - 27 = 14 - 27

5x = -13

5x/5 = -13/5

x = -13/5

9x - 4 = -22

9x - 4 + 4 = -22 + 4

9x = -18

9x/9 = -18/9

x = -2

6x - 4 = 3x + 2

6x - 4 + 4 = 3x + 2 + 4

6x - 3x = 3x + 6 - 3x

3x = 6

3x/3 = 6/3

x = 2

2x - 4 = 5x + 2

2x - 4 - 2x = 5x + 2 - 2x

-4 - 2 = 3x + 2 - 2

-6 = 3x

3x/3 = -6/3

x = -2

2(5x + 6) = x - 8

10x + 12 = x - 8

10x + 12 - x = x - 8 - x

9x + 12 - 12 = -8 - 12

9x = -20

9x/9 = -20/9

x = -20/9

(2x - 5)(x + 3) = 0

Un produit de facteur nul est nul si et seulement si au moins un de ses facteurs est nul :

2x - 5 = 0 ou x + 3 = 0

2x - 5 + 5 = 0 + 5 ou x + 3 - 3 = 0 - 3

2x = 5 ou x = -3

2x/2 = 5/2 ou x = -3

x = 5/2 ou x = -3

(4 + x)/3 = (2x - 1)/5

(4 + x) * 5 = 3 * (2x - 1)

20 + 5x = 6x - 3

20 + 3 + 5x = 6x - 3 + 3

23 + 5x - 5x = 6x - 5x

x = 23