$$9\frac{7}{8}-2\frac{3}{8}$$
$\frac{15}{2}=7.5$
$$\frac{72+7}{8}-\frac{2\times 8+3}{8}$$
$$\frac{79}{8}-\frac{2\times 8+3}{8}$$
$$\frac{79}{8}-\frac{16+3}{8}$$
$$\frac{79}{8}-\frac{19}{8}$$
$$\frac{79-19}{8}$$
$$\frac{60}{8}$$
$$\frac{15}{2}$$
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$\frac{3 \cdot 5}{2} = 7\frac{1}{2} = 7.5$
