aiderr moi svp Résoudre chaque équations: a) 3 (2x + 5) = -7 (3 - 2 x) b) 4 ( 2 - 8x ) - 3 ( -9 x +1) = 0

Bonsoir,


a) 3 (2x + 5) = -7 (3 - 2 x)
6x + 15 = -21 + 14x
6x - 14x = -21 - 15
-8x = - 36
x = -36/(-8)
x = 9/2
x = 4,5



b) 4 ( 2 - 8x ) - 3 ( -9 x +1) = 0
8 - 32x + 27x - 3 = 0
-32x + 27x = -8 + 3
-5x = -5
x = -5/(-5)
x = 1