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x^{2} + y^{2} - 4 x + 14 y = 0

x^{2} + y^{2} - 4 x - 14 y = 0

x^{2} + y^{2} + 4 x + 14 y = 0

x^{2} + y^{2} + 4 x - 14 y = 0

ANS : 4

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