$\frac{dy}{dx}+y=e^{x+2}$
$3\left(2-7x\right)>7\left(1-2x\right)$
$\lim_{x\to4}\left(\frac{1}{x^2-4x}-\frac{3}{x-4}\right)$
$8x-16-7x-21$
$3a-6b+3-7a+10$
$-2x^2-5x+2$
$9f^2-40f^2$
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