$$5 - (6-4\frac{2}{3}):\frac{1}{2}-\frac{5}{6} = 5 - (6 - \frac{14}{3}): \frac{1}{2} - \frac{5}{6} =$$
$$= 5 - (\frac{18}{3} - \frac{14}{3}) : \frac{1}{2} - \frac{5}{6} = 5 - \frac{4}{3} : \frac{1}{2} - \frac{5}{6} =$$
$$= 5 - \frac{4}{3} \cdot 2 - \frac{5}{6} = 5 - \frac{8}{3} - \frac{5}{6} = \frac{30}{6} - \frac{16}{6} - \frac{5}{6} = \frac{9}{6} = \frac{3}{2} = 1.5$$
Ответ: 1,5