\[- 6;\ \ 1;\ - \frac{1}{6};\ldots\]
\[b_{1} = - 6;\ \ q = - \frac{1}{6} < 1.\]
\[S = \frac{b_{1}}{1 - q} = \frac{- 6}{1 + \frac{1}{6}} = - 6\ :\frac{7}{6} = - 6 \cdot \frac{6}{7} =\]
\[= - \frac{36}{7} = - 5\frac{1}{7}.\]
\[Ответ:\ - 5\frac{1}{7}.\]