$$\frac{1}{13}-\frac{3}{117}$$
$\frac{2}{39}\approx 0.051282051$
$$\frac{1}{13}-\frac{1}{39}$$
$$\frac{3}{39}-\frac{1}{39}$$
$$\frac{3-1}{39}$$
$$\frac{2}{39}$$
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$\frac{2}{3 \cdot 13} = 0.05128205128205128$