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xy = 4
x(4x + 1) = 4
4x² + x - 4 = 0
4(x + 1/8)² - 65/16 = 0
x₁ = (1/8)(- 1 - √65) ⇒ y₁ = 32/(- 1 - √65)
x₂ = (1/8)(- 1 + √65) ⇒ y₂ = 32/(- 1 + √65)