Answer
$(\frac{9}{2},-\frac{3}{2})$
Work Step by Step
We are given that the midpoint $M$ of a line segment $PQ$ with endpoints ($x_{1}$,$y_{1}$) and ($x_{2}$,$y_{2}$) is equal to:
$M=(\frac{x_{1}+x_{2}}{2},\frac{y_{1}+y_{2}}{2})$
Therefore, $M=(\frac{3+6}{2},\frac{-6+3}{2})=(\frac{9}{2},\frac{-3}{2})=(\frac{9}{2},-\frac{3}{2})$.