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X(X)=X(10-2X)(20-2X)
We move all terms to the left:
X(X)-(X(10-2X)(20-2X))=0
We add all the numbers together, and all the variables
XX-(X(-2X+10)(-2X+20))=0
We multiply parentheses ..
-(X(+4X^2-40X-20X+200))+XX=0
We calculate terms in parentheses: -(X(+4X^2-40X-20X+200)), so:
X(+4X^2-40X-20X+200)
We multiply parentheses
4X^3-40X^2-20X^2+200X
We do not support eXpression: X^3
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