$\frac{x+2}{x^2+7x+12}$
$5f<\frac{5}{3}$
$3x^2-38x+43$
$\left(x-3\right)y-9+xy\left(x-z^5\right)$
$x^2-\left(3y\right)^2$
$349+85$
$\lim_{x,y\to0,4}\left(2xy\right)^{xy}$
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