Bonjour,

3x + 5 = 6x - 1

3x + 5 -6x = -1

3x -6x = -1 - 5

-3x = -6

x = -6 / -3

x = 2

6x - 2 = 4 (x -3)

6x - 2 = 4x -12

6x - 2 -4x = -12

6x - 4x = -12 + 2

2x = -10

x = -10 / 2

x = - 5

-7x - 12 = -2(-5 -1)

-7x - 12 = 10 + 2

-7x = 12 + 12

x = 24 / -7

x =