A circle \( C \) of radius \( 2 \) lies in the second quadrant and touches both the coordinate axes. Let \( r \) be the radius of a circle that has centre at the point \( (2,5) \) and intersects the circle \( C \) at exactly two points. If the set of all possible values of \( r \) is the interval \( (\alpha,\beta) \), then \( 3\beta-2\alpha \) is equal to:
