$\lim_{x\to1}\left(\frac{x^2+5x-6}{x^2-4}\right)$
$x-7=2-2x$
$\lim_{x\to0}\left(\frac{\sqrt{x^2+9}}{x}\right)$
$1+-3+6+-1$
$\frac{dy}{dx}+\frac{y}{10}=5$
$\int\:x\:e^{85x}\:dx$
$2\cos3x+1=0$
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