$\int\frac{x+4}{x+9}dx$
$-4\left(-8y+-7\right)+11y$
$\lim_{x\to0}\left(\frac{3x-4}{3x+2}\right)^{3x+1}$
$\:xy^'-y=2x^2\:y$
$5\cdot8.50$
$4\left(3k-2\right)$
$\lim_{x\to3}\frac{5}{x^2-9}$
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