Chapter 7 - Review - Page 469: 81

$\left( -5,5 \right)$

Using the Midpoint Formula, $\left( \dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2} \right)$, then the midpoint between the given points is \begin{array}{l} \left( \dfrac{2+(-12)}{2},\dfrac{6+4}{2} \right) \\\\= \left( \dfrac{-10}{2},\dfrac{10}{2} \right) \\\\= \left( -5,5 \right) .\end{array}