Chemistry was my major, and I considered adding this very point, but wasn't sure I could do a good job of explaining what the problem is. You did a great job t

Chemistry was my major, and I considered adding this very point, but wasn't sure I could do a good job of explaining what the problem is. You did a great job there ^_^. Yes: there are positive 'holes' that you push a negative number to and then subtract. This is entirely backward and adds considerable difficulty to an already difficult operation.