5(-3x - 2) - (x - 3) = -4(4x + 5) + 13
-15x - 10 - 1(x - 3) = -4(4x + 5) + 13
-15x - 10 - 1x + 3 = -16x -20 + 13
-16x - 7 = -16x -7
both sides are the same so this equation is true for all real values of x. :)
