$$\frac { 2 } { 5 } + ( \frac { - 4 } { 7 } + \frac { 1 } { 4 } )$$
$\frac{11}{140}\approx 0.078571429$
$$\frac{2}{5}-\frac{4}{7}+\frac{1}{4}$$
$$\frac{14}{35}-\frac{20}{35}+\frac{1}{4}$$
$$\frac{14-20}{35}+\frac{1}{4}$$
$$-\frac{6}{35}+\frac{1}{4}$$
$$-\frac{24}{140}+\frac{35}{140}$$
$$\frac{-24+35}{140}$$
$$\frac{11}{140}$$
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$\frac{11}{2 ^ {2} \cdot 5 \cdot 7} = 0.07857142857142857$
