bonsoir
p 1
x
3 x
3 x + 25
2 ( 3 x + 25 )
= 6 x + 50
6 x + 50 = 80
6 x = 80 - 50 = 30
x = 5
P 2
x
x + 10
11 ( x + 10 ) = 11 x + 110
11 x + 110 + 3
= 11 x + 113
11 x + 113 = 80
11 x = 80 - 113 = - 33
x = - 3
6 x + 50 = 11 x + 113
6 x - 11 x = 113 - 50
- 5 x = 63
x = - 63/5
il faut choisir - 63/5