$$\frac{-13}{20}+\frac{11}{14}+\frac{-5}{7}+\frac{7}{10}$$
$\frac{17}{140}\approx 0.121428571$
$$-\frac{13}{20}+\frac{11}{14}+\frac{-5}{7}+\frac{7}{10}$$
$$-\frac{91}{140}+\frac{110}{140}+\frac{-5}{7}+\frac{7}{10}$$
$$\frac{-91+110}{140}+\frac{-5}{7}+\frac{7}{10}$$
$$\frac{19}{140}+\frac{-5}{7}+\frac{7}{10}$$
$$\frac{19}{140}-\frac{5}{7}+\frac{7}{10}$$
$$\frac{19}{140}-\frac{100}{140}+\frac{7}{10}$$
$$\frac{19-100}{140}+\frac{7}{10}$$
$$-\frac{81}{140}+\frac{7}{10}$$
$$-\frac{81}{140}+\frac{98}{140}$$
$$\frac{-81+98}{140}$$
$$\frac{17}{140}$$
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$\frac{17}{2 ^ {2} \cdot 5 \cdot 7} = 0.12142857142857143$
