bonjour
je ne fais pas tout mais je te montre
a) 5 + 1.5 t = 3 + 2.5 t
1.5 t - 2.5 t = 3 - 5
- t = - 2
t = 2
b) 3 y - 3.5 = 9 y - 3.5
3 y - 9 y = - 3.5 + 3.5
- 6 y = 0
y = 0
a) 7 ( 2 - x ) = - 2 x
14 - 7 x = - 2 x
- 7 x + 2 x = - 14
- 5 x = - 14
x = 14/5
b) 6 x = 15 + 5 x
6 x - 5 x = 15
x = 15
continue
