Réponse :
bonjour,
a) x + 6 = 8
x = 8 - 6
x = 2
b) 7x =4
x = 4/7
c) 5x = 3x + 3
5x - 3x = 3
2x = 3
x = 3/2
d) 7x +1 = 4-x
7x + x = 4 - 1
8x = 3
x = 3/8
e) 4(x + 5) = 10x + 3
4x + 20 = 10x + 3
4x - 10x = 3 -20
-6x = -17
x = -17/-6
x = 17/6
f) 7x - (5x + 3) = 5(x-3)+2
7x - 5x - 3 = 5x - 15 + 2
7x - 5x - 5x = -15 + 2 + 3
-3x = -10
x = -10/3
x = 10/3
voila:)
