Answer
$\frac{x-3}{x+1}$
Work Step by Step
$\frac{x^{2}+2x-15}{x^{2}+6x+5}=\frac{(x+5)(x-3)}{(x+5)(x+1)}=\frac{x-3}{x+1}\times\frac{x+5}{x+5}=\frac{x-3}{x+1}\times1=\frac{x-3}{x+1}$
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