$$\frac{ x7 }{ 160 \times 777777 }$$
$\frac{1}{124444320} = 8.035722321436605 \times 10^{-9}$
$$\frac{\mathrm{d}}{\mathrm{d}x_{7}}(\frac{x_{7}}{124444320})$$
$$\frac{1}{124444320}x_{7}^{1-1}$$
$$\frac{1}{124444320}x_{7}^{0}$$
$$\frac{1}{124444320}\times 1$$
$$\frac{1}{124444320}$$
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$\frac{x_{7}}{124444320}$
$$\frac{x_{7}}{124444320}$$
