(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