bonjour
elle possède x - 5
3 + 13 b = 8 b - 7
13 b - 8 b = - 7 - 3
5 b = - 10
b = - 2
16 a - 20 = 26 a
16 a - 26 a = 20
- 10 a = 20
a = - 2
5.5 x = 4 x + 8
5.5 x - 4 x = 8
1.5 x = 8
x = 8/1.5
12 .5 y + 4 = 3 y - 15
12.5 y - 3 y = - 15 - 4
9.5 y = - 19
y = - 19/9.5
y = - 2
72 t - 1 = 14 t + 3
72 t - 14 t = 3 + 1
58 t = 4
t = 4/58 = 2 /29
es tu sûr de la e ?