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x(x-2)(x-4)=120
We move all terms to the left:
x(x-2)(x-4)-(120)=0
We multiply parentheses ..
x(+x^2-4x-2x+8)-120=0
We multiply parentheses
x^3-4x^2-2x^2+8x-120=0
We do not support expression: x^3
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