(x-1)^2+(y-2)^2=2
(x-1)^2+(7x-15-2)^2=2
x^2-2x+1+49x^2-238x+289=2
50x^2-240x+288=0
25x^2-120x+144=0
(5x)^2-2x5x12+12^2=0
(5x-12)^2=0
x=12/5
y=12/5x7-15=84/5-75/5=9/5