(x*x*x)+x=21

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Solution for (x*x*x)+x=21 equation: 



(x*x*x)+x=21

We move all terms to the left:

(x*x*x)+x-(21)=0

We add all the numbers together, and all the variables

(+x*x*x)+x-21=0

We add all the numbers together, and all the variables

x+(+x*x*x)-21=0

We get rid of parentheses

x+x*x*x-21=0

Wy multiply elements

x^3*x+x-21=0

We do not support expression: x^3

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