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((x)(x2)+x3)/90=90
We move all terms to the left:
((x)(x2)+x3)/90-(90)=0
We add all the numbers together, and all the variables
(+x^3+xx2)/90-90=0
We multiply all the terms by the denominator
(+x^3+xx2)-90*90=0
We do not support expression: x^3
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