Answer
$$\left(1,\:-1\right)$$
Work Step by Step
Using the midpoint formula, we find:
$$ \left(\frac{x_2+x_1}{2},\:\:\frac{y_2+y_1}{2}\right) \\ \left(\frac{6-4}{2},\:\frac{-6+4}{2}\right)\\ \left(1,\:-1\right)$$
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