$$\frac{3\times18}{8}\times\frac{18}{21}$$
$\frac{81}{14}\approx 5.785714286$
$$\frac{54}{8}\times \frac{18}{21}$$
$$\frac{27}{4}\times \frac{18}{21}$$
$$\frac{27}{4}\times \frac{6}{7}$$
$$\frac{27\times 6}{4\times 7}$$
$$\frac{162}{28}$$
$$\frac{81}{14}$$
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$\frac{3 ^ {4}}{2 \cdot 7} = 5\frac{11}{14} = 5.785714285714286$
