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(20-2x)(36-2x)(x)=800
We move all terms to the left:
(20-2x)(36-2x)(x)-(800)=0
We add all the numbers together, and all the variables
(-2x+20)(-2x+36)x-800=0
We multiply parentheses ..
(+4x^2-72x-40x+720)x-800=0
We multiply parentheses
4x^3-72x^2-40x^2+720x-800=0
We do not support expression: x^3
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