bonjour
2 x = - 2 x + 8
2 x + 2 x = 8
4 x = 8
x = 8/4 = 2
4 x - 8 = 7 x + 4
4 x - 7 x = 4 + 8
- 3 x = 12
x = - 4
3 x + 5 = 6 x - 9
3 x - 6 x = - 9 - 5
- 3 x = - 14
x = 14/3
Réponse:
a) 2x = -2x + 8
2x + 2x = 8
4x = 8
x = 8/ 4 = 2
b) 4x - 8 = 7x + 4
-8 - 4 = 7x - 4x
-4 = 3x
-4/3 = x
x = - 1,3333....
c) 3x + 5 = 6x - 9
9 + 5 = 6x - 3x
14 = 3x
x = 14/3 = 4,6666....
