$$\frac { 4 } { 5 } - ( \frac { 3 } { 5 } ) + ( \frac { 4 } { 11 } )$$
$\frac{31}{55}\approx 0.563636364$
$$\frac{4-3}{5}+\frac{4}{11}$$
$$\frac{1}{5}+\frac{4}{11}$$
$$\frac{11}{55}+\frac{20}{55}$$
$$\frac{11+20}{55}$$
$$\frac{31}{55}$$
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$\frac{31}{5 \cdot 11} = 0.5636363636363636$
