A line is a common tangent to the circle \( (x-3)^{2}+y^{2}=9 \) and the parabola \( y^{2}=4 x \...

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A line is a common tangent to the circle \( (x-3)^{2}+y^{2}=9 \) and the parabola \( y^{2}=4 x \). If the two points of contact
P \( (a, b) \) and \( (c, d) \) are distinct and lie in the first quadrant,

W. then \( 2(a+c) \) is equal to
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