Answer
$$-3\frac{1}{8}.$$
Work Step by Step
We simplify by removing the parenthesis and add the terms as follows:
$$
\frac{-5}{8}+ \left( -\frac{5}{6} \right)- \left( +1\frac{2}{3} \right)= - \frac{5}{8} -\frac{5}{6} - \frac{5}{3} \\
=- \frac{15}{24} -\frac{20}{24} - \frac{40}{24} =-\frac{75}{24}=-3\frac{1}{8}.$$
