XF 2.2 Solution displayed only if user is registered

You can hide the post using CSS and the message--solution class and [data-logged-in="false"].
You would also have to hide the block below the first post which uses id js-solutionHighlightBlock.

However, that would be trivial to bypass so to do it properly, you would have to edit the thread_view_type_question template and remove the content using conditional statements.
 
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