We get posts here that are phrased as if from a textbook or homework; the one I have in mind is Find the recurrence relation, but my question is more general. Such posts will certainly be closed.
A lot of times they are closed silently; they accumulate a pile of downvotes, eventually get 5 close votes, and disappear with no indication to the user of what has gone wrong.
Sometimes such questions get the note "Sorry, this question is not appropriate for MO; please take it to MSE." However, we have had moderators for MSE ask us not automatically to re-direct questions there that show no effort by the user to answer themselves.
So, for such questions, I have taken to posting "MO is not for homework questions" so that the user has some idea why their question has been closed. However, on Find the recurrence relation, this comment was deleted, which I assume means it was inappropriate. (I did ask a similar question about a deleted comment recently, but this is not a duplicate; for that one I couldn't tell why it might be inappropriate, whereas here I can guess, although it certainly wasn't my intention to be "unfriendly or unkind".)
What is better (in particular, more welcoming) language for a question that is phrased as homework that should not simply be migrated to MSE (at least, not without additional indication from the user of what they have tried)? Or are some of my premises wrong?