$\frac{x^2}{9}-9$
$3\left(x+4\right)+12x$
$x^2-4x+20$
$x^3-6x^2-7x+60$
$\frac{x^9y^8}{xy}$
$\frac{15p^5\left(q^4\right)^2}{12pq^5p^2}$
$\lim_{x\to-\infty}\left(\frac{x^3+x^2+5x-3}{x^2+2x+4}\right)$
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