$$\frac{5}{9}-\frac{4}{27}=$$
$\frac{11}{27}\approx 0.407407407$
$$\frac{15}{27}-\frac{4}{27}$$
$$\frac{15-4}{27}$$
$$\frac{11}{27}$$
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$\frac{11}{3 ^ {3}} = 0.4074074074074074$