$$(-8)\div\frac{4}{\delta}$$
$-2\delta $
$$\frac{-8\delta }{4}$$
$$-2\delta $$
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$-2$
$$\frac{\mathrm{d}}{\mathrm{d}\delta }(\frac{-8\delta }{4})$$
$$\frac{\mathrm{d}}{\mathrm{d}\delta }(-2\delta )$$
$$-2\delta ^{1-1}$$
$$-2\delta ^{0}$$
$$-2$$