$$\frac{7}{20}-\frac{-3}{14}$$
$\frac{79}{140}\approx 0.564285714$
$$\frac{7}{20}-\left(-\frac{3}{14}\right)$$
$$\frac{7}{20}+\frac{3}{14}$$
$$\frac{49}{140}+\frac{30}{140}$$
$$\frac{49+30}{140}$$
$$\frac{79}{140}$$
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$\frac{79}{2 ^ {2} \cdot 5 \cdot 7} = 0.5642857142857143$
