a) -5x - 6 = x + 12 b) 8 - 2x = -7x + 28 c) x = -10 -3x Avec détail svp

a)
-5x - 6 = x + 12
-5x - x = 12 + 6
-6x = 18
x = -18/6
x = -3.

b)
8 - 2x = -7x + 28
-2x + 7x = 28 - 8
5x = 20
x = 20/5
x = 4.

c)
x = -10 -3x
x + 3x = -10
4x = -10
x = -10/4
x = -5/2.