$$\frac{ 15 }{ 21 } \times \frac{ 45 }{ 3 } - \frac{ 1 }{ 15 } \div \frac{ 3 }{ 7 }$$
$\frac{3326}{315}\approx 10.558730159$
$$\frac{5}{7}\times \frac{45}{3}-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{5}{7}\times 15-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{5\times 15}{7}-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{75}{7}-\frac{\frac{1}{15}}{\frac{3}{7}}$$
$$\frac{75}{7}-\frac{1}{15}\times \frac{7}{3}$$
$$\frac{75}{7}-\frac{1\times 7}{15\times 3}$$
$$\frac{75}{7}-\frac{7}{45}$$
$$\frac{3375}{315}-\frac{49}{315}$$
$$\frac{3375-49}{315}$$
$$\frac{3326}{315}$$
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$\frac{2 \cdot 1663}{3 ^ {2} \cdot 5 \cdot 7} = 10\frac{176}{315} = 10.558730158730159$
