Math Problem Solver

\[ -1 - \frac{-2}{7} = - \frac{5}{7} = -0.\overline{714285} \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{-1}{1}\) and \(\frac{2}{7}\) is \(7\). \[ \begin{aligned} -1 - \frac{-2}{7} &= \frac{-1 \cdot 7}{1 \cdot 7} + \frac{2 \cdot 1}{7 \cdot 1} \\ &= \frac{-7 + 2}{7} \\ &= \frac{-5}{7} \end{aligned} \]