Bonsoir,
a. 2x+4=5x-7 a=3/4
2x - 5x = - 7 - 4
- 3x = - 11
x = 11/3 → Non
b. 2/3x-5=1/2x-3 a=-23/12
2/3x - 5 = 1/2x - 3
4/6x - 30/6 = 3/6x - 18/6
4/6x - 3/6x = 30/6 - 18/6
4x - 3x = 30 - 18
x = 12 → Non
c. x+4=x-7 a=8
x - x = - 7 - 4
0x = - 11 → Non
d. 2x+5=2(x+2)+1 a=-2/3
2x + 5 = 2x + 4 + 1
2x - 2x = 4 + 1 - 5
0x = 5 - 5
0x = 0 → Oui.
