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x^2-y^2-4x+6y=6
(x^2-4x)-(y^2+6y)=6
1(x^2-4x) - 1(y^2+6y)=6
1 (x - 2)^2 - 1 (y+3)^2 = 6
pusat hiber bola = (p,q) = (2,3)