I never saw any discussion on it in meta - but it seems common knowledge that it is unacceptable to both vote to close a question and also answer it.

What about questions that should be migrated?

If a user asks a software question in SO, and I voted to migrate it to SU, is it acceptable if I also propose an answer to it, in SO?


Yes, while some people don't like it when people put answers on dupes, it's certainly not the consensus.
For migration, there's no controversy, just go ahead and give a good answer, and it will migrate with the question over to the other site.


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