We really care about the things that are within delta of 5 but not necessarily equal to 5. This is just a strictly less than. They're within a range of c but not equal to c. That's going to be all of the x's that satisfy x minus 5 is less than. Less than is less than delta. That describes all of these x's right over here. What we're going to do, and the way these proofs typically go, is we're going to try to manipulate the left-hand side of the inequality so it starts to look something like this, or it starts to look exactly like that. As we do that, the right-hand side of the inequality is going to be expressed in terms of delta.