$\lim_{x\to-1}\left(\frac{2x-1}{x+1}\right)$
$dx-e^{-3x}dy=0$
$\frac{x^5+x^3-20x}{x+2}$
$\int\frac{10x+2}{3x^2+2x-1}dx$
$231m^2x+165m^2x-9m^2x$
$\frac{x^3\:-\:5x^2\:+\:16}{x\:-\:4}$
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