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(n+2)(n+1)n(n-1)=360
We move all terms to the left:
(n+2)(n+1)n(n-1)-(360)=0
We multiply parentheses ..
(+n^2+n+2n+2)n(n-1)-360=0
We move all terms containing n to the left, all other terms to the right
(+n^2+n+2n+2)n(n-1)=360
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