$\left(\frac{1}{2}+3a\right)\left(-\frac{1}{2}\right)$
$\frac{dy}{dx}+4y=\frac{\sqrt{2}}{3}\left(1-\sqrt{2}\right)e^x$
$\frac{343-512^3}{7-8r}$
$2cos^2x-5\:cos$
$x+5=e\left(x+1\right)$
$\left(-5\right)\cdot\left(-13\right)$
$7z^2y-12zy^3$
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