$13a^2+7a-6$
$\frac{3xy}{xy}$
$\left(4-a\right)\left(6-a\right)$
$\lim_{x\to0}\left(\frac{x^2}{\cos\left(x\right)-x}\right)$
$\frac{n\left(x-8\right)^n}{n^3+1}$
$x^2-2x-39$
$-3\sqrt{9}$
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