Using the following equation, find the center and radius:
x2 + 2x + y2 + 4y = 20
The center is located at (1, 2), and the radius is 25.
The center is located at (-1, 2), and the radius is 25.
The center is located at (-1, -2), and the radius is 5.
The center is located at (1, 2), and the radius is 5.

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