$$5 - \frac { 10 } { 5 } + \frac { 20 } { 9 } - \frac { 40 } { 27 }$$
$\frac{101}{27}\approx 3.740740741$
$$5-2+\frac{20}{9}-\frac{40}{27}$$
$$3+\frac{20}{9}-\frac{40}{27}$$
$$\frac{27}{9}+\frac{20}{9}-\frac{40}{27}$$
$$\frac{27+20}{9}-\frac{40}{27}$$
$$\frac{47}{9}-\frac{40}{27}$$
$$\frac{141}{27}-\frac{40}{27}$$
$$\frac{141-40}{27}$$
$$\frac{101}{27}$$
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$\frac{101}{3 ^ {3}} = 3\frac{20}{27} = 3.740740740740741$
