Réponse :
Bonjour,
a) 4(2x - 1) = 7
8x - 4 = 7
8x = 7 + 4
8x = 11
x = 11/8
b) -2x + 3 = -2(x - 5)
-2x + 3 = -2x + 10
-2x - 2x = 10 - 3
-4x = 7
x = 7/-4
c) -5(4 + 3x) = 2(-x + 1)
-20 - 15x = -2x + 2
-15x + 2x = 2 + 20
-13x = 22
x = 22/-13
d) -4x - 10 = -5x - 1
-4x + 5x = -1 + 10
x = 9
e) 3/10x + 1,4 = -x + 2
3/10x - 10/10x = 2 - 1,4
-7/10x = 0,6
x = 0,6 / -7/10
x = -6/7
f) 6 - 3x = 5 - x
-3x + x = 5 - 6
-2x = -1
x = -1/-2
x = 1/2
