$$\frac{ x2 }{ 129 \times 222222 }$$
$\frac{1}{28666638} = 3.488375581398837 \times 10^{-8}$
$$\frac{\mathrm{d}}{\mathrm{d}x_{2}}(\frac{x_{2}}{28666638})$$
$$\frac{1}{28666638}x_{2}^{1-1}$$
$$\frac{1}{28666638}x_{2}^{0}$$
$$\frac{1}{28666638}\times 1$$
$$\frac{1}{28666638}$$
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$\frac{x_{2}}{28666638}$
$$\frac{x_{2}}{28666638}$$
