$$\frac{6}{7}of\frac{5}{9}\div\frac{10}{21}$$
$fo$
$$\frac{\frac{6\times 5}{7\times 9}of}{\frac{10}{21}}$$
$$\frac{\frac{30}{63}of}{\frac{10}{21}}$$
$$\frac{\frac{10}{21}of}{\frac{10}{21}}$$
$$\frac{\frac{10}{21}of\times 21}{10}$$
$$\frac{10of}{10}$$
$$of$$
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$f$
