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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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