$$10 \frac { 2 } { 3 } - 6 \frac { 4 } { 9 }$$
$\frac{38}{9}\approx 4.222222222$
$$\frac{30+2}{3}-\frac{6\times 9+4}{9}$$
$$\frac{32}{3}-\frac{6\times 9+4}{9}$$
$$\frac{32}{3}-\frac{54+4}{9}$$
$$\frac{32}{3}-\frac{58}{9}$$
$$\frac{96}{9}-\frac{58}{9}$$
$$\frac{96-58}{9}$$
$$\frac{38}{9}$$
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$\frac{2 \cdot 19}{3 ^ {2}} = 4\frac{2}{9} = 4.222222222222222$
