$$\frac{5}{63}-\frac{-8}{21}$$
$\frac{29}{63}\approx 0.46031746$
$$\frac{5}{63}-\left(-\frac{8}{21}\right)$$
$$\frac{5}{63}+\frac{8}{21}$$
$$\frac{5}{63}+\frac{24}{63}$$
$$\frac{5+24}{63}$$
$$\frac{29}{63}$$
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$\frac{29}{3 ^ {2} \cdot 7} = 0.4603174603174603$
