$$\frac { n } { 5 } + \frac { n } { 5 } =$$
$\frac{2}{5} = 0.4$
$$\frac{\mathrm{d}}{\mathrm{d}n}(\frac{2}{5}n)$$
$$\frac{2}{5}n^{1-1}$$
$$\frac{2}{5}n^{0}$$
$$\frac{2}{5}\times 1$$
$$\frac{2}{5}$$
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$\frac{2n}{5}$
$$\frac{2}{5}n$$