`6x^(2) + 5xy + y^(2) + 9X + 4Y = c``6x^(2) + 5xy + y^(2) - 9x - 4y = c``6x^(2) - 5xy - y^(2) - 9x - 4y = c``3x^(2) + 5xy + 2Y^(2) - 9x - 4y = c`
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