A circle is tangent to the lines $4x - 3y = 30$ and $4x - 3y = -10.$  The center of the circle lies on the line $2x + y = 0.$  Find the center of the circle.
Question:
A circle is tangent to the lines $4x - 3y = 30$ and $4x - 3y = -10.$  The center of the circle lies on the line $2x + y = 0.$  Find the center of the circle.
Answer:
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A circle is tangent to the lines $4x - 3y = 30$ and $4x - 3y = -10.$  The center of the circle lies on the line $2x + y = 0.$  Find the center of the circle.
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