$-\left|-8\right|=-8$
$\lim_{x\to0}\left(\frac{\frac{2}{39+x}-\frac{2}{39}}{x}\right)$
$ab\:por\:-ab$
$\frac{dy}{dx}=\frac{3-x}{y-4}$
$\frac{dy}{dx}+2xy=3$
$\left(6+2x\right)^2\left(3x-2\right)$
$5\cdot\frac{dy}{dx}=y^{2}-4$
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