bonjour
A / 3 x + 3 = 2 x - 2
3 x - 2 x = - 2 - 3
x = - 5 produits en croix
B/ 2 x /2 + 5 /2 = x / 2 - 2/2
2 x - x = - 2 - 5
x = - 7
C / 2 x /6 - 30/6 = 3 x / 6 + 6 /6
2 x - 3 x = 6 + 30
x = 36