$$3 \{ \frac{ 37 }{ 5 } - \frac{ 21 }{ 10 } \} + \frac{ 1 }{ 3 } \{ \frac{ 9 }{ 5 } - \frac{ 6 }{ 10 } \}$$
$\frac{163}{10}=16.3$
$$3\left(\frac{74}{10}-\frac{21}{10}\right)+\frac{1}{3}\left(\frac{9}{5}-\frac{6}{10}\right)$$
$$3\times \frac{74-21}{10}+\frac{1}{3}\left(\frac{9}{5}-\frac{6}{10}\right)$$
$$3\times \frac{53}{10}+\frac{1}{3}\left(\frac{9}{5}-\frac{6}{10}\right)$$
$$\frac{3\times 53}{10}+\frac{1}{3}\left(\frac{9}{5}-\frac{6}{10}\right)$$
$$\frac{159}{10}+\frac{1}{3}\left(\frac{9}{5}-\frac{6}{10}\right)$$
$$\frac{159}{10}+\frac{1}{3}\left(\frac{9}{5}-\frac{3}{5}\right)$$
$$\frac{159}{10}+\frac{1}{3}\times \frac{9-3}{5}$$
$$\frac{159}{10}+\frac{1}{3}\times \frac{6}{5}$$
$$\frac{159}{10}+\frac{1\times 6}{3\times 5}$$
$$\frac{159}{10}+\frac{6}{15}$$
$$\frac{159}{10}+\frac{2}{5}$$
$$\frac{159}{10}+\frac{4}{10}$$
$$\frac{159+4}{10}$$
$$\frac{163}{10}$$
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$\frac{163}{2 \cdot 5} = 16\frac{3}{10} = 16.3$
