It's been a while since i looked at the Refactoring book, but as i recall "Inline Method" is only recommended when the method is only used in a very few number of cases (typically only within the class that defines it)
As you point out, for examples like this it might instead make sense to refactor the constant (5) to a global variable (or to a new method call to get it from configuration) ... either of which might then ultimately lead to a decision to inline the method anyway because it's now easier to read/understand then it was before.
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