$$\quad 9 \frac { 1 } { 5 } - 2 \frac { 3 } { 5 }$$
$\frac{33}{5}=6.6$
$$\frac{45+1}{5}-\frac{2\times 5+3}{5}$$
$$\frac{46}{5}-\frac{2\times 5+3}{5}$$
$$\frac{46}{5}-\frac{10+3}{5}$$
$$\frac{46}{5}-\frac{13}{5}$$
$$\frac{46-13}{5}$$
$$\frac{33}{5}$$
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$\frac{3 \cdot 11}{5} = 6\frac{3}{5} = 6.6$