$$12\div108\times2+9-5$$
$\frac{38}{9}\approx 4.222222222$
$$\frac{1}{9}\times 2+9-5$$
$$\frac{2}{9}+9-5$$
$$\frac{2}{9}+\frac{81}{9}-5$$
$$\frac{2+81}{9}-5$$
$$\frac{83}{9}-5$$
$$\frac{83}{9}-\frac{45}{9}$$
$$\frac{83-45}{9}$$
$$\frac{38}{9}$$
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$\frac{2 \cdot 19}{3 ^ {2}} = 4\frac{2}{9} = 4.222222222222222$
