Answer
$\frac{x-5}{3x}$
Work Step by Step
Given : $\frac{1}{x+5} \times \frac{x^{2}-25}{3x}= \frac{1}{x+5} \times \frac{(x+5)(x-5)}{3x}=\frac{x-5}{3x}$
(After dividing out the common factor (x+5))
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