$\left(xy^2+7\right)\left(xy^2-7\right)$
$\lim_{h\to7}\frac{x+8}{x-7}$
$150\:\cdot5$
$20x^2-20x+25$
$\frac{dx}{dy}+166.667x=0$
$\left(\frac{a}{5}-1\right)\left(\frac{a}{5}+1\right)$
$\frac{x^2+2x+6}{x-3}$
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