$\frac{x^2+5x+2}{x}$
$\left(2m\right)x^{4m-3}+\left(5+m\right)x^{m+9}$
$\frac{r^2-16}{r+4}$
$\lim_{x\to0}\left(\frac{2sin\left(\frac{x}{2}\right)}{x}\right)^2$
$14r+11>-227$
$81x^2-36x$
$\int7x^2e^{x^3}dx$
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