Bonjour,
Résoudre ces équations :
1) 5x + 3 = 2x + 7
5x - 2x = 7 - 3
3x = 4
x = 4/3
2) 3x - 4 = x + 2
3x - x = 2 + 4
2x = 6
x = 6/2
x = 3
3) 4 - 5x = 7x + 8
- 5x - 7x = 8 - 4
- 12x = 4
x = - 4/12
x = - 1/3
4) -3 + 2x = -5x + 11
2x + 5x = 11 + 3
7x = 14
x = 14/7
x = 2
5) 3 ( x + 2 ) = 21
3x + 6 = 21
3x = 21 - 6
3x = 15
x = 15/3
x = 5
6) -4 ( 2 - x ) = 20
- 8 + 4x = 20
4x = 20 + 8
4x = 28
x = 28/4
x = 7
Le reste n'est pas complet
