$18abd-32bda$
$24^2+34+5$
$\frac{r^6-8}{r^2-2}$
$-40-215$
$81^{0.5t^2+t}$
$3.1+0\left(-1\right)+\left(-1\right)\left(0\right)$
$14\:-\:\left(-7\right)\:$
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