a2+b2+c2-2a+4b-6c+14=0
(a^2-2a+1)+(b^2+4b+4)+(c^2-6c+9)=0
(a-1)^2+(b+2)^2+(c-3)^2=0
a=1 b=-2 c=3
c-a+b=3-1-2=0