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900=x(20-2x)(30-2x)
We move all terms to the left:
900-(x(20-2x)(30-2x))=0
We add all the numbers together, and all the variables
-(x(-2x+20)(-2x+30))+900=0
We multiply parentheses ..
-(x(+4x^2-60x-40x+600))+900=0
We calculate terms in parentheses: -(x(+4x^2-60x-40x+600)), so:
x(+4x^2-60x-40x+600)
We multiply parentheses
4x^3-60x^2-40x^2+600x
We do not support expression: x^3
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