$$\frac{x^{2}-4x-21}{3x^{2}+10x+3}$$
$\frac{x-7}{3x+1}$
$$\frac{\left(x-7\right)\left(x+3\right)}{\left(x+3\right)\left(3x+1\right)}$$
$$\frac{x-7}{3x+1}$$
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