(х+3)³=-8
(х+3)³+8=0
х+3=-2
х=-2-3
х=-5
(x+3)³=-8
(x+3)³=(-2)³
x+3=-2
(x+3)³=-8 (это проверка)
(-5+3)³=-8
(-2)³=-8
-8=-8
(х+3)³=-8
(х+3)³+8=0
х+3=-2
х=-2-3
х=-5
(x+3)³=-8
(x+3)³=(-2)³
x+3=-2
х=-2-3
х=-5
(x+3)³=-8 (это проверка)
(-5+3)³=-8
(-2)³=-8
-8=-8