$$\frac{ 2 }{ 3 } - \frac{ 5 }{ 9 } =$$
$\frac{1}{9}\approx 0.111111111$
$$\frac{6}{9}-\frac{5}{9}$$
$$\frac{6-5}{9}$$
$$\frac{1}{9}$$
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$\frac{1}{3 ^ {2}} = 0.1111111111111111$