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(x²-6x+9)+(y²-12y+36)=9
x²-6x+9+y²-12y+36=9
x²+y²-6x-12y=-36
b) (x+4)²+(y+8)²=8²
(x²+8x+16)+(y²+16y+64)=64
x²+y²+8x+16y=-16