e) - \(\frac{5}{8}\) + \(\frac{5}{6}\);

e) - \(\frac{5}{8}\) + \(\frac{5}{6}\) = - \(\frac{5 \cdot 3}{8 \cdot 3}\) + \(\frac{5 \cdot 4}{6 \cdot 4}\) = - \(\frac{15}{24}\) + \(\frac{20}{24}\) = \(\frac{20 - 15}{24}\) = \(\frac{5}{24}\)