$$(\frac{7}{-26}+\frac{16}{39})=?$$
$\frac{11}{78}\approx 0.141025641$
$$-\frac{7}{26}+\frac{16}{39}$$
$$-\frac{21}{78}+\frac{32}{78}$$
$$\frac{-21+32}{78}$$
$$\frac{11}{78}$$
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$\frac{11}{2 \cdot 3 \cdot 13} = 0.14102564102564102$
