$$\frac { 12 } { 3 } + 2 \frac { 4 } { 5 }$$
$\frac{34}{5}=6.8$
$$4+\frac{2\times 5+4}{5}$$
$$4+\frac{10+4}{5}$$
$$4+\frac{14}{5}$$
$$\frac{20}{5}+\frac{14}{5}$$
$$\frac{20+14}{5}$$
$$\frac{34}{5}$$
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$\frac{2 \cdot 17}{5} = 6\frac{4}{5} = 6.8$
