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Given that the circleS `x^(2)+y^(2)-2 x+6 y+6=0` and `x^(2)+y^(2)-5 x+6 y+15=0` touch, the equation of their common tangtnt is

A

`x=3`

B

`y=6`

C

`7 x-12 y-21=0`

D

`7 x+12 y+21=0`

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The correct Answer is:
A
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