Réponse :
Bonjour,
a. 7x - 4 = 5x + 6
7x - 5x = 6 + 4
2x = 10
x = 10/2
x = 5
b. 3 - 2x = -9 + 3x
-2x - 3x = -9 -3
-5x = -12
x = 12/5
c. 4,3x + 12 = 33 - 5,7x
4,3x + 5,7x = 33 - 12
10x = 21
x = 21/10
x = 2,1
d. 3x - 2x + 8 = 5 + 4 - 8x
3x - 2x + 8x = 5 + 4 - 8
9x = 1
x = 1/9
