{х^2+y^2+2x=0
{0x^2+y^2+2y=0
{x^2+y^2+2x=0
{y^2+2y=0
y^2+2y=0
y=0
y=-2
x^2+0^2+2x=0
x^2+(-2)^2+2x=0
x=0
x=-2
0^2+0^2+2×0=0^2+0^2+2×0
(-2)^2+0^2+2(-2)=0×(-2)^+0^2+2×0
0=0=0
(X1,y1)=(0,0)
(x2,y2)=(-2,0)
{х^2+y^2+2x=0
{0x^2+y^2+2y=0
{x^2+y^2+2x=0
{y^2+2y=0
y^2+2y=0
y=0
y=-2
x^2+0^2+2x=0
x^2+(-2)^2+2x=0
x=0
x=-2
0^2+0^2+2×0=0^2+0^2+2×0
(-2)^2+0^2+2(-2)=0×(-2)^+0^2+2×0
0=0=0
0=0=0
(X1,y1)=(0,0)
(x2,y2)=(-2,0)