Answer
$log_{9}7-log_{9}(8y)$
Work Step by Step
We know that $log_{b}\frac{x}{y}=log_{b}x-log_{b}y$ (where $x$, $y$, and $b$ are positive real numbers and $b\ne1$).
Therefore, $log_{9}\frac{7}{8y}=log_{9}7-log_{9}(8y)$.
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