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Ball landing point calculation only returns positives?

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So I have a landing point calculation for the most part working. However, it's only returning positive numbers...when the ball itself moves both ways, X/-X. The game plays out in X/Y coordinates, with locked Z - this is all 2D. I know I'm on the right track, but I'd really like it to also return negative coordinates. What am I doing wrong in my code? To be honest, it's probably something really stupid! Vector3 BallMinder = BallPosition.position; float BallX = BallMinder.x; float BallY = BallMinder.y; float GroundHitPointX = (BallX + BallY); Addtional Information: The ball moves by pure gravity and physics. No additional forces are added aside from impacts it may take, which are not coded. X serves as position, Y serves as time until the ground.

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