$$\frac{ 15 }{ 21 } of \frac{ 45 }{ 3 } - \frac{ 1 }{ 15 } \div \frac{ 3 }{ 7 }$$
$\frac{75fo}{7}-\frac{7}{45}$
$$\frac{5}{7}of\times \frac{45}{3}-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{5}{7}of\times 15-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{5\times 15}{7}of-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{75}{7}of-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{75}{7}of-\frac{1}{15}\times \frac{7}{3}$$
$$\frac{75}{7}of-\frac{1\times 7}{15\times 3}$$
$$\frac{75}{7}of-\frac{7}{45}$$
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$\frac{3375fo-49}{315}$
$$\frac{3375of-49}{315}$$
