$$\frac{ 4x }{ 680 \times 44444444 }$$
$\frac{x}{7555555480}$
$$\frac{x}{170\times 44444444}$$
$$\frac{x}{7555555480}$$
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$\frac{1}{7555555480} = 1.323529425 \times 10^{-10}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{170\times 44444444})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{7555555480})$$
$$\frac{1}{7555555480}x^{1-1}$$
$$\frac{1}{7555555480}x^{0}$$
$$\frac{1}{7555555480}\times 1$$
$$\frac{1}{7555555480}$$
