$$\frac{ 7x }{ 160 \times 777777 }$$
$\frac{x}{17777760}$
$$\frac{x}{160\times 111111}$$
$$\frac{x}{17777760}$$
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$\frac{1}{17777760} = 5.625005625005625 \times 10^{-8}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{160\times 111111})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{17777760})$$
$$\frac{1}{17777760}x^{1-1}$$
$$\frac{1}{17777760}x^{0}$$
$$\frac{1}{17777760}\times 1$$
$$\frac{1}{17777760}$$
