To solve for x, we need to isolate x on one side of the equation.

First, we can simplify the equation by combining like terms:

18 + 5x = 10 + 3x

Subtract 3x from both sides:

18 + 2x = 10

Subtract 18 from both sides:

2x = -8

Divide by 2:

x = -4

Therefore, the solution to the equation is x = -4.