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x^{3} - p x^{2} + q x + r = 0

x^{3} + p x^{2} + q x + r = 0

x^{3} + p x^{2} + q x + p r = 0

r x^{3} + p x^{2} + q x + p r = 0

r x^{3} + p x^{2} + q x - 1 = 0

r x^{3} - q x^{2} + p x - 1 = 0

ANS : 5

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