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The two circles x^2 +y^2-2x+6y+6=0 and x...

The two circles `x^2 +y^2-2x+6y+6=0` and `x^2 +y^2-5x+6y+15=0` touch each other. The equation of their common tangent is

A

`x=3`

B

`y=6`

C

`7x-12y-21=0`

D

`7x+12y+21=0`

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