\[- 1\frac{1}{6} + \left( - 2\frac{3}{8} \right) =\]
\[= - \left( 1\frac{1^{\backslash 4}}{6} + 2\frac{3^{\backslash 3}}{8} \right) =\]
\[= - \left( 1\frac{4}{24} + 2\frac{9}{24} \right) = - 3\frac{13}{24}.\]