Réponse :
Explications étape par étape :
a) x + 7 = 1
x + 7 - 7 = 1 - 7
x = - 6
b) -4x = 48
-4x / -4 = 48 / -4
x = -12
c) 5(x+3) = -8
5x + 15 = -8
5x + 15 - 15 = -8 -15
5x = -23
5x / 5 = -23 / 5
x = -23/5
d) 2/3 x - 5/4 = 5/8 - 2x
2/3 x + 2x - 5/ 4 + 5/ 4 = 5/ 8 - 5/ 4 -2x + 2x
2/3 x + 6/ 3 = 5/ 8 - 10 /8
8/3 x = -5/ 8
8/3x / (8/3) = (-5/8) / (2/3)
x = (-5/8) X (3/2)
x = -15 / 16
