$$3 \frac{ 3 }{ 4 } +6 \frac{ 1 }{ 2 } -2 \frac{ 7 }{ 8 }$$
$\frac{59}{8}=7.375$
$$\frac{12+3}{4}+\frac{6\times 2+1}{2}-\frac{2\times 8+7}{8}$$
$$\frac{15}{4}+\frac{6\times 2+1}{2}-\frac{2\times 8+7}{8}$$
$$\frac{15}{4}+\frac{12+1}{2}-\frac{2\times 8+7}{8}$$
$$\frac{15}{4}+\frac{13}{2}-\frac{2\times 8+7}{8}$$
$$\frac{15}{4}+\frac{26}{4}-\frac{2\times 8+7}{8}$$
$$\frac{15+26}{4}-\frac{2\times 8+7}{8}$$
$$\frac{41}{4}-\frac{2\times 8+7}{8}$$
$$\frac{41}{4}-\frac{16+7}{8}$$
$$\frac{41}{4}-\frac{23}{8}$$
$$\frac{82}{8}-\frac{23}{8}$$
$$\frac{82-23}{8}$$
$$\frac{59}{8}$$
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$\frac{59}{2 ^ {3}} = 7\frac{3}{8} = 7.375$