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220=x(18-2x)(12-2x)
We move all terms to the left:
220-(x(18-2x)(12-2x))=0
We add all the numbers together, and all the variables
-(x(-2x+18)(-2x+12))+220=0
We multiply parentheses ..
-(x(+4x^2-24x-36x+216))+220=0
We calculate terms in parentheses: -(x(+4x^2-24x-36x+216)), so:
x(+4x^2-24x-36x+216)
We multiply parentheses
4x^3-24x^2-36x^2+216x
We do not support expression: x^3
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