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(12x-15)(12x-21)(x)=945
We move all terms to the left:
(12x-15)(12x-21)(x)-(945)=0
We multiply parentheses ..
(+144x^2-252x-180x+315)x-945=0
We multiply parentheses
144x^3-252x^2-180x^2+315x-945=0
We do not support expression: x^3
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