$$6 \frac { 1 } { 4 } + \{ 4 \frac { 1 } { 8 } - ( \frac { 3 } { 4 } + \frac { 1 } { 8 } ) \}$$
$\frac{19}{2}=9.5$
$$\frac{24+1}{4}+\frac{4\times 8+1}{8}-\left(\frac{3}{4}+\frac{1}{8}\right)$$
$$\frac{25}{4}+\frac{4\times 8+1}{8}-\left(\frac{3}{4}+\frac{1}{8}\right)$$
$$\frac{25}{4}+\frac{32+1}{8}-\left(\frac{3}{4}+\frac{1}{8}\right)$$
$$\frac{25}{4}+\frac{33}{8}-\left(\frac{3}{4}+\frac{1}{8}\right)$$
$$\frac{25}{4}+\frac{33}{8}-\left(\frac{6}{8}+\frac{1}{8}\right)$$
$$\frac{25}{4}+\frac{33}{8}-\frac{6+1}{8}$$
$$\frac{25}{4}+\frac{33}{8}-\frac{7}{8}$$
$$\frac{25}{4}+\frac{33-7}{8}$$
$$\frac{25}{4}+\frac{26}{8}$$
$$\frac{25}{4}+\frac{13}{4}$$
$$\frac{25+13}{4}$$
$$\frac{38}{4}$$
$$\frac{19}{2}$$
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$\frac{19}{2} = 9\frac{1}{2} = 9.5$