$$\frac{ 2x }{ 129 \times 222222 }$$
$\frac{x}{14333319}$
$$\frac{x}{129\times 111111}$$
$$\frac{x}{14333319}$$
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$\frac{1}{14333319} = 6.976751162797674 \times 10^{-8}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{129\times 111111})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{14333319})$$
$$\frac{1}{14333319}x^{1-1}$$
$$\frac{1}{14333319}x^{0}$$
$$\frac{1}{14333319}\times 1$$
$$\frac{1}{14333319}$$