$$\frac{ 15 }{ 28 } + \frac{ 13 }{ 42 }$$
$\frac{71}{84}\approx 0.845238095$
$$\frac{45}{84}+\frac{26}{84}$$
$$\frac{45+26}{84}$$
$$\frac{71}{84}$$
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$\frac{71}{2 ^ {2} \cdot 3 \cdot 7} = 0.8452380952380952$
