$2\left(\frac{d^2y}{dx^2}\right)+\frac{dy}{dx}-y=0$
$200,6+131$
$\frac{\sqrt{m-n}}{a}+\sqrt{\frac{m}{n^2}+\frac{-1}{n}}$
$-239+351$
$-80-90-40$
$2x-3y-x-y$
$\frac{5x^7\:7^8}{9}$
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