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    $\begingroup$ You're not looking for Factor, but for Collect[expr, {a, b, c}]. $\endgroup$ Commented Mar 18, 2025 at 12:18
  • $\begingroup$ thank you so much @Domen $\endgroup$ Commented Mar 18, 2025 at 12:29
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    $\begingroup$ It seems you oversimplified your actual problem to the point of being trivial. Maybe it is better to update your question with the example in comments? $\endgroup$ Commented Mar 18, 2025 at 14:54
  • $\begingroup$ Personally, I like the question in its present form. As a question, it is not easy to find the answer in the docs, until someone points out, "Look up Collect[]", which to me is the purpose of this Q&A. Unless it's a duplicate, it seems to me a helpful Q&A to leave open. If the OP has a localized problem with a particular expression, it's probably better to ask separately, "How to use Collect[] to gather specific terms?" $\endgroup$ Commented Mar 18, 2025 at 15:38