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\frac{-n-1}{3}
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\frac{-n-1}{3}
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-\frac{1}{3}\left(n+1\right)
Combine \frac{n+1}{6} and -\frac{n+1}{2} to get -\frac{1}{3}\left(n+1\right).
-\frac{1}{3}n-\frac{1}{3}
Use the distributive property to multiply -\frac{1}{3} by n+1.
-\frac{1}{3}\left(n+1\right)
Combine \frac{n+1}{6} and -\frac{n+1}{2} to get -\frac{1}{3}\left(n+1\right).
-\frac{1}{3}n-\frac{1}{3}
Use the distributive property to multiply -\frac{1}{3} by n+1.
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