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(18+-2x)(12+-2x)(x)=216
We move all terms to the left:
(18+-2x)(12+-2x)(x)-(216)=0
We add all the numbers together, and all the variables
(-2x)(-2x)x-216=0
We multiply parentheses ..
(+4x^2)x-216=0
We multiply parentheses
4x^3-216=0
We do not support expression: x^3
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