$2\cdot3^2-3\cdot1-2^2$
$\int\frac{1}{x^2+2x-12}dx$
$\lim_{x\to4}\left(\frac{x-3}{\sqrt{x+5}-3}\right)$
$\frac{x}{9}-7=-9$
$\frac{\left(2^2\right)^3\left(2^3\right)^2}{4}$
$\int4^{10x}dx$
$\frac{a}{14}=\frac{14}{b}$
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