4(x-5) = 0
(x-3)(x+4) = 0

Expanding the expressions:

4x - 20 = 0
x^2 + x - 12 = 0

Setting each expression to zero and solving for x:

4x - 20 = 0
4x = 20
x = 5

x^2 + x - 12 = 0
(x + 4)(x - 3) = 0
x = -4 or x = 3

Therefore, the solutions are x = 5, x = -4, and x = 3.