$$3/7x5/12$$
$\frac{1}{28} = 0.03571428571428571$
$$\frac{\mathrm{d}}{\mathrm{d}x_{5}}(\frac{1}{28}x_{5})$$
$$\frac{1}{28}x_{5}^{1-1}$$
$$\frac{1}{28}x_{5}^{0}$$
$$\frac{1}{28}\times 1$$
$$\frac{1}{28}$$
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$\frac{x_{5}}{28}$
$$\frac{1}{28}x_{5}$$