Réponse :
bonjour
5 x = 3 x + 3
5 x - 3 x = 3
2 x = 3
x = 3/2
8 x = 12 x + 4
8 x - 12 x = 4
- 4 x = 4
x = - 1
4 - 7 y = 10 y
- 7 y - 10 y = - 4
- 14 y = - 4
y = 4/14 = 2/7
7x = - 4 - x
7 x + x = - 4
8 x = - 4
x = - 4/8 = - 1 /2
Explications étape par étape :