TITLE: For x < 5 what is the greatest value of x
QUESTION [21 upvotes]: It can't be $5$. And it can't be $4.\overline{9}$ because that equals $5$. It looks like there is no solution... but surely there must be?

REPLY [19 votes]: The answer is $4$, assuming the domain of $x$ is $\Bbb Z$.