$\left(2\:-\:r\right)\:\left(2\:+\:r\right)\:$
$\frac{9}{3x+2}=2+3x$
$15xy-3x+10y-2$
$\frac{2m}{\sqrt{5}}$
$v^2+4v-96$
$\lim_{x\to1}\left(\frac{3}{x}\right)^{\frac{1}{x}}$
$5\left(-4k-8\right)$
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