$$2/3+2/9$$
$\frac{8}{9}\approx 0.888888889$
$$\frac{6}{9}+\frac{2}{9}$$
$$\frac{6+2}{9}$$
$$\frac{8}{9}$$
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$\frac{2 ^ {3}}{3 ^ {2}} = 0.8888888888888888$