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Given a positive integer $n$. Find all $x$ such that $\phi{(x)} = n$.

This kind of questions exists here. Such as Solutions of $\phi(x)=n$ for a given n.
But my question is different. I am looking for an approach to find all solution $x$. Is there any algorithm/method how to do this?
I also managed to find this OEIS sequence A032447. But that doesn't help me.

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    I think this question is a duplicate as well. – 2017-02-20
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    There should be an anwer mentioning how to bound the possible numbers. I do not remember exactly where, but I remember such a bound. – 2017-02-20

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