$$( \frac{ 1 }{ 2 } + \frac{ 2 }{ 9 } )- \frac{ 4 }{ 15 } + \frac{ 5 }{ 18 }$$
$\frac{11}{15}\approx 0.733333333$
$$\frac{9}{18}+\frac{4}{18}-\frac{4}{15}+\frac{5}{18}$$
$$\frac{9+4}{18}-\frac{4}{15}+\frac{5}{18}$$
$$\frac{13}{18}-\frac{4}{15}+\frac{5}{18}$$
$$\frac{65}{90}-\frac{24}{90}+\frac{5}{18}$$
$$\frac{65-24}{90}+\frac{5}{18}$$
$$\frac{41}{90}+\frac{5}{18}$$
$$\frac{41}{90}+\frac{25}{90}$$
$$\frac{41+25}{90}$$
$$\frac{66}{90}$$
$$\frac{11}{15}$$
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$\frac{11}{3 \cdot 5} = 0.7333333333333333$
