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x(x+10)(2x-10)=180
We move all terms to the left:
x(x+10)(2x-10)-(180)=0
We multiply parentheses ..
x(+2x^2-10x+20x-100)-180=0
We multiply parentheses
2x^3-10x^2+20x^2-100x-180=0
We do not support expression: x^3
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