I'm going through the limits in the book and here is one of the exercises:
Find an open interval about $c$ on which the inequality $|f(x) - L| < \epsilon$ holds:
$f(x) = mx, m > 0, L=2m, c=3, $ $\epsilon = c > 0$
Usually in these exercises $\epsilon$ would be a number, but now it's an expression. And I don't understand how to read it.
Does it mean $\epsilon$ equals $c$ if $c >0$?