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(n+2)(n+1)n=210
We move all terms to the left:
(n+2)(n+1)n-(210)=0
We multiply parentheses ..
(+n^2+n+2n+2)n-210=0
We multiply parentheses
n^3+n^2+2n^2+2n-210=0
We do not support enpression: n^3
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