The center of the ellipse is the midpoint of the foci. The midpoint formula is:
Midpoint = $\left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)$
Plugging in the coordinates of the foci, we get:
Midpoint = $\left(\frac{-6 + (-6)}{2}, \frac{9 +
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