$$\frac{-5}{16}-\frac{-23}{24}$$
$\frac{31}{48}\approx 0.645833333$
$$-\frac{5}{16}-\frac{-23}{24}$$
$$-\frac{5}{16}-\left(-\frac{23}{24}\right)$$
$$-\frac{5}{16}+\frac{23}{24}$$
$$-\frac{15}{48}+\frac{46}{48}$$
$$\frac{-15+46}{48}$$
$$\frac{31}{48}$$
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$\frac{31}{2 ^ {4} \cdot 3} = 0.6458333333333334$