Réponse :
bonjour
3 x/4 = 5
3 x = 20
x = 20/3
4 x - 3 = 11
4 x = 11 +3
4 x = 14
x = 14/4 = 7/2
7 - 8 x = 56
- 8 x = 56 - 7
- 8 x = 49
x = - 49/8
6 x - 4 = 3 x + 14
6 x - 3 x = 14 + 4
3 x = 18
x = 18/3 = 6
9 - 2 x = 11 + 4 x
- 2 x - 4 x = 11 - 9
- 6 x = 2
x = - 2/6 = - 1 /3
Bonjour :)
bon courage !
