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

The two circles `x^2 + y^2 -2x+6y+6=0 and x^2 + y^2 - 5x + 6y + 15 = 0` touch eachother. 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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