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(20-2x)(30-2x)(x)=1008
We move all terms to the left:
(20-2x)(30-2x)(x)-(1008)=0
We add all the numbers together, and all the variables
(-2x+20)(-2x+30)x-1008=0
We multiply parentheses ..
(+4x^2-60x-40x+600)x-1008=0
We multiply parentheses
4x^3-60x^2-40x^2+600x-1008=0
We do not support expression: x^3
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