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729=x*x*x

We move all terms to the left:

729-(x*x*x)=0

We add all the numbers together, and all the variables

-(+x*x*x)+729=0

We get rid of parentheses

-x*x*x+729=0

Wy multiply elements

-1x^3*x+729=0

We do not support expression: x^3

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