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(18x-12)(10x+20)15x=180
We move all terms to the left:
(18x-12)(10x+20)15x-(180)=0
We multiply parentheses ..
(+180x^2+360x-120x-240)15x-180=0
We multiply parentheses
2700x^3+5400x^2-1800x^2-3600x-180=0
We do not support expression: x^3
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