Answer
$M(0,0)$
Work Step by Step
use the midpoint formula
$M(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})$
substitute
$M(\frac{-3+3}{2},\frac{2+-2}{2})$
simplify
$M(\frac{0}{2},\frac{0}{2})$
$M(0,0)$
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