$$2\frac{1}{3}\times5\frac{4}{21}$$
$\frac{109}{9}\approx 12.111111111$
$$\frac{6+1}{3}\times \frac{5\times 21+4}{21}$$
$$\frac{7}{3}\times \frac{5\times 21+4}{21}$$
$$\frac{7}{3}\times \frac{105+4}{21}$$
$$\frac{7}{3}\times \frac{109}{21}$$
$$\frac{7\times 109}{3\times 21}$$
$$\frac{763}{63}$$
$$\frac{109}{9}$$
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$\frac{109}{3 ^ {2}} = 12\frac{1}{9} = 12.11111111111111$
