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( x-3)^2 +(y +4)^2=( x-y +5)^2 / 2
2 x^2 +18 -12x + 2 y^2 + 32+ 16 y = x^2+ y^2- 2xy+ 25 + 10x - 10y
x^2 + y^2 + 2 xy = 22x-26y -25
2 x^2 +18 -12x + 2 y^2 + 32+ 16 y = x^2+ y^2- 2xy+ 25 + 10x - 10y
x^2 + y^2 + 2 xy = 22x-26y -25
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