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= y² - 2√7y + 7 - (14x²y - 4x⁴ - 49y² + 14x²y) =
= y² + 2√7y + 7 - 14x²y + 4x⁴ + 49y² - 14x²y =
= 50y² - 28x²y + 4x⁴ + 2√7y + 7