\[\left( \frac{6}{7} \right)^{- 1} + 6^{- 2} - ( - 3,5)^{0} =\]
\[= \frac{7^{\backslash 6}}{6} + \frac{1}{36} - 1^{\backslash 36} =\]
\[= \frac{42 + 1 - 36}{36} = \frac{7}{36}\]