Bonjour,
Résoudre les quatre équations suivantes
1) 4x+20=6x+24
4x - 6x = 24 - 20
- 2x = 4
x = - 4/2
x = - 2
2) 7-3x=8+5x
- 3x - 5x = 8 - 7
- 8x = 1
x = - 1/8
3) (3x-2)(9x+5=0
3x - 2 = 0 ou 9x + 5 = 0
3x = 2 9x = - 5
x = 2/3 x = - 5/9
4) 2(3x+5)=7+3(x+3)
6x + 10 = 7 + 3x + 9
6x - 3x = 9 - 10 + 7
3x = 6
x = 6/3
x = 2.
