$dt+e^{3t}dy=0$
$a^2-2a-168=0$
$\frac{d}{dx}\sqrt{29}$
$xdy+ydx=2dx$
$s^2+6s+7$
$1029-65+12-28$
$\lim_{x\to0}\left(\frac{x}{x^2-7x+1}\:\right)$
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