(for some reason it had to change two of the signs that are bolded instead of using the minuses again.)
In this other example I'm about to show you doesn't need to "keep, change, flip":
I just don't understand why some of these problems on Combining Integers use keepchangeflip but others don't. I wouldn't know whether I'd need to use it or not...do any of you know what I'm talking about? lol.