x²+y2+6x-8y-10=0
(x-2)²+(y+6)² = 60
3x²+3y²+12x+18y-15=0
(x+2)²+(y+3)² = 18
5x2+5y2-10x+20y-30=0
(x+1)²+(y-6)²=46
2x2+2y2-24x-16y-8=0
x²+y2+2x-12y-9=0