设圆心的坐标为(x,-2x-2),半径为R,则有:
(1-x)^2+(1+2x+2)^2=R^2
(-3-x)^2+(5+2x+2)^2=R^2
联立解得:x=-2,R^2=82
所以圆的方程为:(x+2)^2+(y-2)^2=82