$\frac{9}{1-x^8}$
$\frac{a^2-16}{a-4}$
$-8-2\left(8-5n\right)$
$4x^2+12x+60$
$m^2+50m+m$
$\lim_{x\to+\infty}\left(\frac{x^7+5x}{e^x}\right)$
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