Bonjour
Résoudre les équations suivantes :
a) 3(2x - 7) = 4-(2x +1)
6x - 21 = 4 - 2x - 1
6x + 2x = 4 - 1 + 21
8x = 24
x = 24/8
x = 3
b) 4+2(2x + 1) = x -1
4 + 4x + 2 = x - 1
4x - x = - 1 - 4 - 2
3x = - 7
x = - 7/3
c) 9+ 2x + 7 = 4x – 1
2x - 4x = - 1 - 9 - 7
- 2x = - 17
x = 17/2.