Réponses

2014-10-15T20:57:05+02:00
Bonsoir

a)
3 x - 5x =  9 +7
- 2x = 16
x = -16/2 = - 8

b)
8x -16 = 8x -16 - 12 x
8 x - 8 x +12x = - 16 +16
12 x = 0
x = 0

c)
6x -3 = 2 - x +3
6 x + x = 3 + 2 +3
7 x = 8
x = 8/7


d)
2x - 3x = 14 - 9
- x = 5
x = -5

e)
 2(x-3)=16
2x - 6 = 16
2 x = 16 +6
2x = 22
x = 11