$$\frac{20}{5}-\frac{15}{14}=$$
$\frac{41}{14}\approx 2.928571429$
$$4-\frac{15}{14}$$
$$\frac{56}{14}-\frac{15}{14}$$
$$\frac{56-15}{14}$$
$$\frac{41}{14}$$
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$\frac{41}{2 \cdot 7} = 2\frac{13}{14} = 2.9285714285714284$
