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(12-2x)(15-2x)x=162
We move all terms to the left:
(12-2x)(15-2x)x-(162)=0
We add all the numbers together, and all the variables
(-2x+12)(-2x+15)x-162=0
We multiply parentheses ..
(+4x^2-30x-24x+180)x-162=0
We multiply parentheses
4x^3-30x^2-24x^2+180x-162=0
We do not support expression: x^3
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