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y3+y2=9y+9
We move all terms to the left:
y3+y2-(9y+9)=0
We add all the numbers together, and all the variables
y^3+y^2-(9y+9)=0
We get rid of parentheses
y^3+y^2-9y-9=0
We do not support eypression: y^3
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