Prove that the centres of the three circ...

Prove that the centres of the three circles `x^2 + y^2 - 4x – 6y – 12 = 0,x^2+y^2 + 2x + 4y -5 = 0 and `
`x^2 + y^2 - 10x – 16y +7 = 0` are collinear.

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