bonjour
4r + 5 + 3r + 2 = 19.
7 r = 19 - 7
7 r = 12
r = 12/7
9s + 11 - 7s + 9= 2.
2 s = 2 - 11 - 9
2 s = - 18
s = - 9
-3t - 7 - 5t - 12 = -2.
- 8 t = - 2 + 7 + 12
- 8 t = 17
t = - 17/8
7w - 3 - 2w + 5 = 2w + 2.
7 w - 2 w - 2 w = 2 + 3 - 5
3 w = 0
w = 0
-4x + 5 + 2x - 9 = -2x - 4.
- 2 x + 2 x = - 4 - 5 + 9
0 x = 0
tout nombre est solution
6y + 7 - 9y - 4 = -3y - 3.
- 3 y + 3 y = - 3 - 7 + 4
0 y = - 6
pas de solution
