$$40/63 \div (7/15 \times 4/14)$$
$\frac{100}{21}\approx 4.761904762$
$$\frac{40\times 14}{63\times \frac{7}{15}\times 4}$$
$$\frac{2\times 10}{\frac{7}{15}\times 9}$$
$$\frac{20}{\frac{7}{15}\times 9}$$
$$\frac{20}{\frac{7\times 9}{15}}$$
$$\frac{20}{\frac{63}{15}}$$
$$\frac{20}{\frac{21}{5}}$$
$$20\times \frac{5}{21}$$
$$\frac{20\times 5}{21}$$
$$\frac{100}{21}$$
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$\frac{2 ^ {2} \cdot 5 ^ {2}}{3 \cdot 7} = 4\frac{16}{21} = 4.761904761904762$
