I was wondering if there was any way to find and use the value a variable used to equal. I need to pull up that old value and compare the difference to the current value. For example, x might start out equalling 48 as a result of some input. It then changes to 104. I want to take the current value of 104 and subtract from it the original input. I've been looking around but haven't been able to find anything related to this.