$$\frac{x^{2}-2x-15}{3x^{2}-12x-15}$$
$\frac{x+3}{3\left(x+1\right)}$
$$\frac{\left(x-5\right)\left(x+3\right)}{3\left(x-5\right)\left(x+1\right)}$$
$$\frac{x+3}{3\left(x+1\right)}$$
$$\frac{x+3}{3x+3}$$
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