$\frac{1}{4}m+\frac{2}{5}n\:2\:\cdot\frac{1}{4}m-\frac{2}{5}n$
$-5xy+8xt$
$-6\:+9\:+4\:+\:-2\:-6\:-9\:-\:-3\:-5\:-6$
$5\tan x-1=0$
$\frac{dy}{dx}\left(-9x^5+y^8=9x\right)$
$-1-36-2$
$10n^2-n-2$
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