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$\sum _{ n=1 }^{ \infty }{ \dfrac { \cos { \left( \frac { n \pi }{ 3 } \right) } }{ { 3 }^{ n } } } =\frac { \alpha }{ \beta }$ The equation above holds true for coprime positive integers $\alpha$ and $\beta$. Find $\alpha+\beta$.

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