I'm currently trying to prove the equation that you see above.
I know that it must have something to do with the laws of divisibility, and these rules in conjunction with rules about integers, but other than that I'm rather stumped as to how one might begin looking at a problem like this.
I tried setting all the given variables equal to the rest of them, but couldn't really go anywhere with that. Any help/suggestions of ways to approach and think about this problem is most appreciated!