Three identical metal balls, A, B, and C are mounted on insulating rods. Initially, Ball A has a charge of -2q, Ball B has a charge of +q, and Ball C is uncharged (as shown in the diagram below.) Ball A is touched to Ball B and then the two balls are separated. Ball B is then touched with Ball C, after which the two balls are separated. Finally Ball A and Ball C are touched together and then separated. At the end of this experiment, the final charge on ball C is:

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