$36a^2-4$
$100m+10m^2$
$48^{21}$
$15y^3-20y^2-20y$
$\frac{9x^2}{3x^3}$
$\lim_{x\to7}\left(\frac{x-7}{7x^2-42}\right)$
$\left(m-12n-16p-5r\right)+\left(8m-12p-15r+n\right)\left(-5m+8p-4n+r\right)$
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