\[C(x;y):\]
\[x = \frac{- 8 + 2}{2} = - \frac{6}{2} = - 3;\]
\[y = \frac{3 + 7}{2} = \frac{10}{2} = 5.\]
\[C( - 3;5).\]
\[Ответ:C( - 3;5).\]