The circle defined by the equation (x+4)^2+(y-3)^2=9 is moved horizontally until its center is on the line x = 6. How many units to the right does the center of the circle move?

The center moves 2 units.

The center of the circle (x + 4)^{2} + (y - 3)^{2} = 9 is the point (-4, 3).

Moving the point (-4, 3) to the point (6, 3) takes 10 units.