\(a\)

\(-a\)

\(+\dfrac{4}{5}\)

\(0\)

\(-\dfrac{1}{5}\)

\(+\dfrac{3}{7}\)

\(+\dfrac{4}{7}\)

\(-\dfrac{5}{8}\)

\(-\dfrac{3}{8}\)

\(+\dfrac{1}{10}\)

\(-\dfrac{1}{13}\)