Distribute first:
6x - 18 + 4x + 8 = 17x - 51 - 2x - 4
Combine like terms:
10x - 10 = 15x - 55
Subtract 10x from both sides and add 55 to both sides to get variables on one side and constants on the other:
- 10 + 55 = 15x - 10x
Combine like terms:
45 = 5x
Divide by 5 on both sides to isolate the variable:
45 / 5 = x
9 = x