Let's try to do that. Let's think about being within delta of our c. Let's think about this right over here as 5 plus delta. This is 5 minus delta. That's our range we're going to think about. We're going to think about it in the abstract at first, and then we're going to try to come up with a formula for delta in terms of epsilon. How can we describe all of the x's that are in this range but not equal to 5 itself? We really care about the things that are within delta of 5 but not necessarily equal to 5.