It just uses regular readable maths so its either Sprite.X-750 or +750
Upload a cap.x if you are still having issues as its so much easier to help that way.
Okay so it is + instead. I thaugth only variations of - worked since for platform set vector x it is no - and number for movement to rigth and - and number movement to the left so i thaugth just set x was the same but i guess not. Thanks for the help anyway. It was helpful and nice.