$-15-2\cdot9$
$\frac{dy}{dx}=\frac{xy}{x^2-4}$
$\int\left(2x\:+\:1\right)e^xdx$
$2x\:-\:x\:-\:x$
$\left(x+y\right)dx+dy=0$
$x^2-8x+11\le0$
$3\sqrt{135}+6\cdot3\sqrt{40}$
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