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n(n+1)(n+2)=1320
We move all terms to the left:
n(n+1)(n+2)-(1320)=0
We multiply parentheses ..
n(+n^2+2n+n+2)-1320=0
We multiply parentheses
n^3+2n^2+n^2+2n-1320=0
We do not support enpression: n^3
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