Bsr svp j'ai besoin d'aide en math . 1.) 4(x-3) - 2(3x-1) =5x-7 2.) 2x+1 / 3 - 4=0 3.) 3-x / 3 + 2x+1 / 4 =1 Svp merci

Bonjour,

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

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

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

-3 = 7x

x = -3/7

2.) 2x+1 / 3 - 4=0

(2x + 1)/3 = 4

2x + 1 = 4 * 3

2x = 12 - 1

x = 11/2

3.) 3-x / 3 + 2x+1 / 4 =1

4(3 - x)/12 + 3(2x + 1)/12 = 1

12 - 4x + 6x + 3 = 1 * 12

15 + 2x = 12

2x = 12 - 15

x = -3/2