Answer
$m=\frac{-1}{20}$
Work Step by Step
$\log_{9}m - \log_{9}(m -4)=-2$
$\log_{9}\frac{m}{m-4}=-2$
$\frac{m}{m-4}=9^{-2}$
$m= \frac{1}{81}(m-4)$
$\frac{80}{81}m=\frac{-4}{81}$
$m=\frac{-1}{20}$
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