$\lim_{x\to-4}\left(\frac{x^2-7x+12}{x^2-16}\right)$
$2x\:\:-1y\:\:+3z\:\:=\:\:-1$
$x\frac{dy}{dx}+2y=3x^2+2x$
$\frac{\sin\left(3z+z^2\right)}{\left(6-z^4\right)^3}$
$\left(2x+3\right)\left(2x+6\right)$
$64x^2-144+82$
$\frac{4}{25}x^2+\frac{44}{5}x+121$
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