$$5\frac{3}{5}-3\frac{1}{10}$$
$\frac{5}{2}=2.5$
$$\frac{25+3}{5}-\frac{3\times 10+1}{10}$$
$$\frac{28}{5}-\frac{3\times 10+1}{10}$$
$$\frac{28}{5}-\frac{30+1}{10}$$
$$\frac{28}{5}-\frac{31}{10}$$
$$\frac{56}{10}-\frac{31}{10}$$
$$\frac{56-31}{10}$$
$$\frac{25}{10}$$
$$\frac{5}{2}$$
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$\frac{5}{2} = 2\frac{1}{2} = 2.5$
