$$15+ \frac{ 10 \times 5 }{ 21 }$$
$\frac{365}{21}\approx 17.380952381$
$$15+\frac{50}{21}$$
$$\frac{315}{21}+\frac{50}{21}$$
$$\frac{315+50}{21}$$
$$\frac{365}{21}$$
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$\frac{5 \cdot 73}{3 \cdot 7} = 17\frac{8}{21} = 17.38095238095238$
