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x2 + y2 + 4x - 2y - 20 = 0
x2 + y2 + 4x + 2y - 20 = 0
x2 + y2 - 4x + 2y - 20 = 0
x2 + y2 - 4x - 2y + 20 = 0
ANS : 3
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