X=3x2+x3

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Solution for X=3x2+x3 equation: 



X=3X^2+X3

We move all terms to the left:

X-(3X^2+X3)=0

We get rid of parentheses

-3X^2+X-X3=0

We add all the numbers together, and all the variables

-3X^2-1X^3+X=0

We do not support eXpression: X^3

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