$5a-8a+a-6a+21a$
$-2f+4f+9f-2f-9$
$4x-8<x-2$
$5x^3-3x^3$
$\left(\frac{r^{3\:}s^{-1}}{r^2s^6}\right)^{-1}$
$\lim_{x\to2}\left(\frac{\sqrt{4u+1}-3}{xu-2}\right)$
$x ^ { 2 } + 5 x + 16 > 0$
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