$$1\frac{1}{6}\times\frac{18}{1}$$
$21$
$$\frac{6+1}{6}\times \frac{18}{1}$$
$$\frac{7}{6}\times \frac{18}{1}$$
$$\frac{7}{6}\times 18$$
$$\frac{7\times 18}{6}$$
$$\frac{126}{6}$$
$$21$$
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$3\times 7$
