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n(n+1)(2n+1)+6(n+1)^2=0
We multiply parentheses ..
n(+2n^2+n+2n+1)+6(n+1)^2=0
We multiply parentheses
2n^3+n^2+2n^2+n+6(n+1)^2=0
We do not support enpression: n^3
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