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(12-2x)(9-2x)*x=54
We move all terms to the left:
(12-2x)(9-2x)*x-(54)=0
We add all the numbers together, and all the variables
(-2x+12)(-2x+9)*x-54=0
We multiply parentheses ..
(+4x^2-18x-24x+108)*x-54=0
We multiply parentheses
4x^3-18x^2-24x^2+108x-54=0
We do not support expression: x^3
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