The midpoint formula is given by $\left(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2}\right)$. Here, the coordinates of the endpoints of the diameter are $(-5,0)$ and $(5,0)$. So, the center of the circle is $\left(\frac{-5+5}{2}, \frac{0+0}{2}\right)$ which simplifies to
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