$7\:-\:4y\:+\:x\:+\:9y$
$\frac{dy}{dx}=\frac{2x-9}{y}$
$a^5+10a^4+30a^3+20a^2-31a-30$
$\int\tan3x\:dx$
$p^{2\:}+\:40\:-\:12$
$\frac{6r^9\:\left(-2\right)^6\:s^2}{3r^3\:\left(-2\right)^2\:s}$
$\lim x\to0\left(\frac{sin\left(x\right)}{x}\right)$
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