Réponse :

bonjour,

3x + 5 = 2

3x = 2 - 5

3x = -3

x = -3/3

x = -1

4x - 3 = 1

4x = 1 + 3

4x = 4

x = 4/4

x= 1

7x = 6

x = 6/7

7x - 4 = 5x +1

7x - 5x = 1 +4

2x = 5

x = 5/2

-3x + 2 = 4x + 5

-3x -4x = 5 -2

-7x = 3

x = -3/7

11x + 7 = 9x - 1

11x - 9x = -1- 7

2x = -8

x = -8/2

x = -4

voila:)