Four tangent circles are centered on the x-axis. The radius of A is twice the radius of

Question:

Four tangent circles are centered on the x-axis. The radius of ⊙A is twice the radius of ⊙O. The radius of ⊙B is three times the radius of ⊙O. The radius of ⊙C is four times the radius of ⊙O. All circles have integer radii and the point (63, 16) is on ⊙C. What is the equation of ⊙A?