$$\frac{ 5 }{ 63 } -(- \frac{ 6 }{ 21 } )$$
$\frac{23}{63}\approx 0.365079365$
$$\frac{5}{63}-\left(-\frac{2}{7}\right)$$
$$\frac{5}{63}+\frac{2}{7}$$
$$\frac{5}{63}+\frac{18}{63}$$
$$\frac{5+18}{63}$$
$$\frac{23}{63}$$
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$\frac{23}{3 ^ {2} \cdot 7} = 0.36507936507936506$
