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XNA2D negative to Positive values

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ok this may have a rediculous ans that im missing :P but .... if i define a Varible as
GameBall.Velocity = (-GameBall.Velocity);
how would you reverse this? (e.g)
GameBall.Velocity = (+GameBall.Velocity); //i know this doesnt work but it Illustrates what im trying to do

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Nice thank you :) its also worked just doing the same thing

GameBall.Velocity = (-GameBall.Velocity); on an already -GameBall.Velocity just made it pos ofc :P

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