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(28-2x)(20-2x)x=924
We move all terms to the left:
(28-2x)(20-2x)x-(924)=0
We add all the numbers together, and all the variables
(-2x+28)(-2x+20)x-924=0
We multiply parentheses ..
(+4x^2-40x-56x+560)x-924=0
We multiply parentheses
4x^3-40x^2-56x^2+560x-924=0
We do not support expression: x^3
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