Réponses

2015-05-11T17:53:40+02:00
A) 5 (x - 2) = 2x + (x + 6)
5x - 10 = 2x + x + 6
5x - 2x - x = 6 + 10
2x = 16
x = 16/2
x = 8

b) 12 - (5x - 9) = 4x + 3
12 - 5x + 9 = 4x + 3
- 5x - 4x = 3 - 12 - 9
- 9x = - 18
x = 18/9
x = 2