$\frac{6^{14}}{6^8}$
$z^5z^{-3}z^{-4}$
$ab-2a-5b+10$
$a+b+2\:a+b\:-2$
$\int\frac{x}{2\sqrt{9-\left(x+\frac{1}{2}\right)^2}}dx$
$17\:=\:2\:-\:3x$
$6m-9n+21nx-14mx$
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