Question 1101114
{{{25(x^2-4x/5)+25(y^2+6y/5)=-13}}}

{{{25(x^2-4x/5+16/100)+25(y^2+6y/5+36/100)=-13+4+9}}}

{{{25(x-4/10)^2+25(y+6/10)^2=0}}}

{{{highlight((x-2/5)^2+(y+3/5)^2=0)}}}
This is not a circle, has no radius, but center is at  (2/5, -3/5).