$\lim_{x\to0}\frac{\pi}{x^2}\frac{x}{3x}$
$r^2+2r-7=0$
$e^{x+y}dy=xdx$
$p2\:+\:4p\:=\:3$
$4x^2+3x-7$
$\int\frac{x}{5}\:dx$
$7+\left(16-4^2\right)-8$
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