(х+1)(х-1)(х-2)-(х2 - 7х)(х-4)-2-2х
(х²-х+х-1)(х-1)-(х²-7х)(х-4)-2-2х
х³-х²+х²-х+х²-х+1-х³-4х²-7х²+28х-2-2х
-8х²-26х-1