$\frac{r^2-11r+30}{r-6}$
$2x-12<x+2$
$\frac{x^2+3x\:-3}{x+4}$
$\frac{x^3-27}{x+3}$
$8a^3+27a^6$
$20\cdot28$
$\int\left(\frac{x}{\left(4t^2+9\right)}\right)dx$
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