`X^(2) - 4xy +y^(2) + 6x - 10 y = C``x^(2) - 4xy + y^(2) + 6x + 10 y = c``x^(2) + 4xy + y^(2) + 6x - 10 y = c``x^(2) - 4xy - y^(2) - 6x - 10 y = c`
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