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`6x^(2) +6y^(2) - 7x - 6y = 0 ``16x^(2) + 16y^(2) - 17x - 16y = 0 ` `x^(2) + y^(2) - 7x - 6y = 0 ``6x^(2) + 6y^(2) + 7x + 6y = 0 `

Answer :

A