4x + 12 - 10x - 8 = 8x - 24 + 5x

Combine like terms:

-6x + 4 = 13x - 24

Add 6x to both sides:

4 = 19x - 24

Add 24 to both sides:

28 = 19x

Divide by 19 on both sides:

x = 28/19