x2+y2−4x−6y+4=0x^{2}+y^{2}-4 x-6 y+4=0x2+y2−4x−6y+4=0
x2+y2−4x−6y=9x^{2}+y^{2}-4 x-6 y=9x2+y2−4x−6y=9
2x2+3y2−4x−6y+4=02 x^{2}+3 y^{2}-4 x-6 y+4=02x2+3y2−4x−6y+4=0
2x2+3y2−4x−6y=92 x^{2}+3 y^{2}-4 x-6 y=92x2+3y2−4x−6y=9