(х-2)•(х²-2х+4)-х•(х-3)•(х+3)=26
х³-2х²+4х+2х²-4х+8-х•(х²-9)=26
х³-2х²+4х+2х²-4х+8-х³+9х=26
9х=26-8
х=2
(х-3)•(х²+3х+9)-х•(х²-16)=21
х³+3х²+9х-3х²-9х-27-х³+16х=21
16х=21+27
16х=48
х=3
(2х-1)•(4х²+2х+1)=23+4х•(2х²-3)
8х³+4х²+2х-4х²-2х-1=23+8х³-12х
8х³+4х²-2х-4х²-2х-8х³+12х=23+1
8х=24
х=3
16х•(4х²-5)+17=(4х+1)•(16х²-4х+1)
64х³-80х+17=64х³-16х²+4х+16х²-4х+1
64х³-80х+17=64х³+1
64х³-80х-64х³=1-17
-80х=16
х=-0.2