Answer
$-\frac{3}{2}$
Work Step by Step
$-\frac{5}{6}+(-\frac{2}{3})=-\frac{5}{6}+(-\frac{2\times2}{3\times2})=-\frac{5}{6}+(-\frac{4}{6})=-(\frac{5}{6}+\frac{4}{6})=-(\frac{5+4}{6})=-(\frac{9}{6})=-\frac{9}{6}=-\frac{9\div3}{6\div3}=-\frac{3}{2}$