`(x - 3)(x + 3)(x + 2) - (x - 1)(x^2 - 3) - 5x(x + 4)^2 - (x - 5)^2`
`= (x^2 - 9)(x + 2) - (x^3 - 3x - x^2 + 3) - 5x(x^2 + 8x + 16) - (x^2 - 10x + 25)`
`= (x^3 + 2x^2 - 9x - 18) - x^3 + 3x + x^2 - 3 - 5x^3 - 40x^2 - 80x - x^2 + 10x - 25`
`= (x^3 - x^3 - 5x^3) + (2x^2 + x^2 - 40x^2 - x^2) - (9x + 80x - 10x) - (18 + 3 + 25)`
`= -5x^3 - 38x^2 - 79x - 46`