Factor
\frac{-2n+3^{n+1}-3\times 2^{n}}{3}
Evaluate
\frac{-2n+3^{n+1}-3\times 2^{n}}{3}
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\frac{3\times 3^{n}-3\times 2^{n}-2n}{3}
Factor out \frac{1}{3}.
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