Réponses

2014-05-20T21:34:15+02:00
Bonsoir

je te fais la suite qui était à l'envers

3x  +2 = 2x -5
3x -2x = -5 -2
x = -7


7x +5 = -3x +2
7x +3x = 2 -5
10x = -3
x = -3/10
2014-05-20T21:43:38+02:00
A)
4x+11 = 2x+15
4x-2x = 15-11
2x = 4
x = 4/2
x = 2

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

c)
3x+2 = 2x-5
3x-2x = -5-2
x = -7

d)
7x+5 = -3x+2
7x+3x = 2-5
10x = -3
x = -3/10
x = -0,3