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440=x(20-2x)(18-x)
We move all terms to the left:
440-(x(20-2x)(18-x))=0
We add all the numbers together, and all the variables
-(x(-2x+20)(-1x+18))+440=0
We multiply parentheses ..
-(x(+2x^2-36x-20x+360))+440=0
We calculate terms in parentheses: -(x(+2x^2-36x-20x+360)), so:
x(+2x^2-36x-20x+360)
We multiply parentheses
2x^3-36x^2-20x^2+360x
We do not support expression: x^3
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