з) -3\(\frac{7}{12}\) - 2\(\frac{5}{8}\).

з) -3\(\frac{7}{12}\) - 2\(\frac{5}{8}\) = -\(\frac{3 * 12 + 7}{12}\) - \(\frac{2 * 8 + 5}{8}\) = -\(\frac{43}{12}\) - \(\frac{21}{8}\) = -\(\frac{43 * 2}{12 * 2}\) - \(\frac{21 * 3}{8 * 3}\) = -\(\frac{86}{24}\) - \(\frac{63}{24}\) = \(\frac{-86 - 63}{24}\) = \(\frac{-149}{24}\) = -6\(\frac{5}{24}\)