$$\frac{5}{7}+\frac{13}{28}+\frac{13}{4}|$$
$\frac{89}{70}\approx 1.271428571$
$$\frac{2}{10}+\frac{5}{10}+\frac{13+3}{28}$$
$$\frac{2+5}{10}+\frac{13+3}{28}$$
$$\frac{7}{10}+\frac{13+3}{28}$$
$$\frac{7}{10}+\frac{16}{28}$$
$$\frac{7}{10}+\frac{4}{7}$$
$$\frac{49}{70}+\frac{40}{70}$$
$$\frac{49+40}{70}$$
$$\frac{89}{70}$$
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$\frac{89}{2 \cdot 5 \cdot 7} = 1\frac{19}{70} = 1.2714285714285714$
