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(x-15)(x+30)(3x)=180
We move all terms to the left:
(x-15)(x+30)(3x)-(180)=0
We multiply parentheses ..
(+x^2+30x-15x-450)3x-180=0
We multiply parentheses
3x^3+90x^2-45x^2-1350x-180=0
We do not support expression: x^3
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