bonsoir
x/2 + 4 = - 7
x /2 = - 7 - 4
x /2 = - 11
x / 2 = - 22 /2
x = - 22
3 y / 7 - 1 = 8
3 y /7 - 7/7 = 56/7
3 y = 56 + 7
3 y = 63
y = 21
5 x + 1 = x /3 - 1
15 x /3 + 3 /3 = x /3 - 3 /3
15 x - x = - 3 - 3
14 x = - 6
x = - 6/14 = - 3 /7
t - 3 /4 = 2 t + 7
4 t /4 - 3 /4 = 8 t /4 + 28/4
4 t - 8 t = 28 + 3
- 4 t = 31
t = - 31/4
bonne soirée
