Answer
$\frac{m+5}{4}$
Work Step by Step
$\frac{m^{2}-25}{4m-20}=\frac{(m+5)(m-5)}{4(m-5)}=\frac{m+5}{4}\times\frac{m-5}{m-5}=\frac{m+5}{4}\times1=\frac{m+5}{4}$
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