$7x^2+21x+7$
$4\log x-3\log y$
$-x\:=\:\:5$
$\frac{b^9+1}{b-1}$
$\lim_{x\to1}\left(\frac{t^8-1}{t^5-1}\right)$
$\int\left(\frac{3-s}{\sqrt{16+6s-s^2}}\right)ds$
$\int xsin\left(\frac{2}{x}\right)dx$
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