(x+1)(x−2)(x−3)(x+1)(x-2)(x-3)(x+1)(x−2)(x−3)
(x−1)(x−2)(x+3)(x-1)(x-2)(x+3)(x−1)(x−2)(x+3)
(x−1)(x+20(x−3)(x-1)(x+20(x-3) (x−1)(x+20(x−3)
(x−1)(x−2)(x−3)(x-1)(x-2)(x-3)(x−1)(x−2)(x−3)