\[\left( \frac{3^{\backslash 2}}{7} + \frac{1}{14} \right)\ :(5,5 - 8) =\]
\[= \frac{6 + 1}{14}\ :( - 2,5) = \frac{7}{14}\ :\left( - \frac{5}{2} \right) =\]
\[= \frac{1}{2} \cdot \left( - \frac{2}{5} \right) = - \frac{1}{5} = - 0,2.\]