$$3\frac{7}{8}-1\frac{1}{2}$$
$\frac{19}{8}=2.375$
$$\frac{24+7}{8}-\frac{1\times 2+1}{2}$$
$$\frac{31}{8}-\frac{1\times 2+1}{2}$$
$$\frac{31}{8}-\frac{2+1}{2}$$
$$\frac{31}{8}-\frac{3}{2}$$
$$\frac{31}{8}-\frac{12}{8}$$
$$\frac{31-12}{8}$$
$$\frac{19}{8}$$
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$\frac{19}{2 ^ {3}} = 2\frac{3}{8} = 2.375$
