$\lim_{x\to2}\left(\frac{x^2-5x+6}{x^2}\right)$
$\frac{a}{20}=\frac{a}{50}+\frac{3}{10}$
$\lim_{x\to4}\left(\frac{5x^2+8x-48}{x+4}\right)$
$4x^2-64=0$
$54x-44x^2+10$
$e^xe^y$
$-3\left(2+7x\right)-3x$
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