$\left(\frac{5}{6}a^2-9\right)\left(\frac{5}{6}a^2+9\right)$
$\frac{18}{n^2}\left(\frac{n\left(n+1\right)}{2}\right)$
$-3y<-15$
$\frac{48x}{2}$
$\left(\sqrt{4ab}\right)^5\left(\sqrt{9ab}\right)^7$
$\frac{x^3-2x+3}{x^3-9x}$
$2.97+-2.25$
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