Ononot — A circle is orthogonal to x^2 + y^2 = 9 and x^2 + y^2 - 8x +

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Circles & Conicshard

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A circle is orthogonal to $x^2 + y^2 = 9$ and $x^2 + y^2 - 8x + 7 = 0$ . What is the $x$ -coordinate of its center?