$$\frac{4}{7}+\frac{2}{14}-\frac{7}{8}\div\frac{7}{4}$$
$\frac{3}{14}\approx 0.214285714$
$$\frac{4}{7}+\frac{1}{7}-\frac{\frac{7}{8}}{\frac{7}{4}}$$
$$\frac{4+1}{7}-\frac{\frac{7}{8}}{\frac{7}{4}}$$
$$\frac{5}{7}-\frac{\frac{7}{8}}{\frac{7}{4}}$$
$$\frac{5}{7}-\frac{7}{8}\times \frac{4}{7}$$
$$\frac{5}{7}-\frac{7\times 4}{8\times 7}$$
$$\frac{5}{7}-\frac{4}{8}$$
$$\frac{5}{7}-\frac{1}{2}$$
$$\frac{10}{14}-\frac{7}{14}$$
$$\frac{10-7}{14}$$
$$\frac{3}{14}$$
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$\frac{3}{2 \cdot 7} = 0.21428571428571427$
