........
.............
( х + 3)(х² - 3х + 9) = х (х + 3) (х - 3)
х³ + 27 = х * (х² - 9)
х³ + 27 = х³ - 9х
27 = - 9х
- 9х = 27
х = - 3
........
.............
( х + 3)(х² - 3х + 9) = х (х + 3) (х - 3)
х³ + 27 = х * (х² - 9)
х³ + 27 = х³ - 9х
27 = - 9х
- 9х = 27
х = - 3