$$46\frac{7}{8}-7\frac{3}{8}$$
$\frac{79}{2}=39.5$
$$\frac{368+7}{8}-\frac{7\times 8+3}{8}$$
$$\frac{375}{8}-\frac{7\times 8+3}{8}$$
$$\frac{375}{8}-\frac{56+3}{8}$$
$$\frac{375}{8}-\frac{59}{8}$$
$$\frac{375-59}{8}$$
$$\frac{316}{8}$$
$$\frac{79}{2}$$
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$\frac{79}{2} = 39\frac{1}{2} = 39.5$
