Question 1043596
{{{x^2+y^2+z^2=2(x+z-1)}}}
{{{x^2+y^2+z^2=2x+2z-2}}}
{{{x^2-2x+y^2+z^2-2z=-2}}}
{{{x^2-2x+1+y^2+z^2-2z+1=-2+1+1}}}
{{{(x-1)^2+y^2+(z-1)^2=0}}}
That describes the point with {{{system(x=1,y=0,z=1)}}} ,
and substituting those values for the variables we get
{{{x^2+y^2+z^2=1^2+0^2+1^2=highlight(2)}}}