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Suppose $f$ is a continuous, positive real-valued function such that $f(x + y) = f(x)f(y)$ for all real $x,y.$

If $f(8) = 3$ then $\log_{9}(f(2015)) = \dfrac{a}{b}$, where $a$ and $b$ are positive coprime integers. Find $a - b.$

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