$$\frac{x^{2}+7x+12}{x^{2}+9x+20}$$
$\frac{x+3}{x+5}$
$$\frac{\left(x+3\right)\left(x+4\right)}{\left(x+4\right)\left(x+5\right)}$$
$$\frac{x+3}{x+5}$$
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