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Show that the circles x^(2) + y^(2) + 6x...

Show that the circles `x^(2) + y^(2) + 6x + 14y + 9 = 0` and `x^(2) + y^(2) - 4x - 10y - 7 = 0` touch each other externally, find also the equation of the common tangent of the two circles.

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