$-107+670$
$\left(3a\right)^2-2$
$19\:-\:\left(-10\right)$
$-5x-1<-6$
$\frac{\sqrt{x+25}-5}{9-\sqrt{81}+x}$
$\frac{4a^4b}{5\:}-\frac{4ab^4}{5}$
$\frac{1000x^9+216y^9}{10x+6y}$
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