$\frac{dy}{ds}+4y-e^{-s}=0$
$2\frac{dy}{dx}-4y=xe^x$
$\left(+8\right)x\left(-10\right)$
$5a+5a$
$2w\:+\:7\:=\:27$
$\lim_{x\to\frac{\pi}{4}}\left(1-tan\left(x\right)\right)\cdot sec\left(2x\right)$
$\int x\cdot\sqrt{3-2x}dx$
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