$a^2\:-\:12a\:-88$
$-2\left(x+3\right)=-4$
$x+-4=7$
$\int _ { 2 } ^ { 2 } d x$
$\int x^2e^{21x}dx$
$\lim_{x\to-20}\left(\frac{\sin\left(\sqrt{x+20}\right)}{x+20}\right)$
$7\:=\:2y\:+\:9$
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