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3x^2-4x=12-x3
We move all terms to the left:
3x^2-4x-(12-x3)=0
We add all the numbers together, and all the variables
3x^2-(-1x^3+12)-4x=0
We get rid of parentheses
3x^2+1x^3-4x-12=0
We do not support expression: x^3
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