Solve the equation 5x - 3x + 9 - 1 = 4(5) - x.

First we simplify each side of the equation to find that

2x + 8 = 20 - x

Then we add x to each side and subtract 8 from each side to find that

3x = 12

and finally multiply each side of the equation by (or equivalently, divide each side by 3) to find that