$$(\frac{-5}{8})-(\frac{-6}{4})$$
$\frac{7}{8}=0.875$
$$-\frac{5}{8}-\frac{-6}{4}$$
$$-\frac{5}{8}-\left(-\frac{3}{2}\right)$$
$$-\frac{5}{8}+\frac{3}{2}$$
$$-\frac{5}{8}+\frac{12}{8}$$
$$\frac{-5+12}{8}$$
$$\frac{7}{8}$$
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$\frac{7}{2 ^ {3}} = 0.875$