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  • $\begingroup$ Can you supply an expression where using Coefficient doesn't work? That way, we can actually test out various solutions. $\endgroup$ Commented Feb 23, 2022 at 18:50
  • $\begingroup$ Any example involving the sum of Logs would work, really. Take for example: 1 + (3+n) Log[1-x] + (3+n) Log[1-x]. Mathematica will not rewrite it in the form I want, even after FullSimplify. In this case I simply need the equation n = -3. I did not provide the example because I have a lot of different forms, sometimes involving ArcTanh as I said, and I don't want to make separate cases for each. $\endgroup$ Commented Feb 23, 2022 at 19:35
  • $\begingroup$ Sorry, I meant 1 + (3+n) Log[1-x] + (3+n) Log[1+x] (with a +). I can no longer edit my previous comment. See also my comment on the answer below for another kind of example, for which Coefficient would actually work. $\endgroup$ Commented Feb 23, 2022 at 19:48