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방정식 x^2 + y^2 - 4x + 6y - 12 = 0 에서 중심과 반지름을 구하라 (완전제곱)
방정식 x^2 + y^2 - 4x + 6y - 12 = 0 에서 중심과 반지름을 구하라 (완전제곱)
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