Sorry if I just overlooking something, but I don't see how to merge two questions in one.

I asked question [Can be profitable to migrate from Windows to Linux in a small business?](https://unix.stackexchange.com/questions/47865/can-be-profitable-to-migrate-from-windows-to-linux-in-a-small-business) which was by opinion of others confusing. In order to improve my question I re-ask it as was suggested in comments. Thus I created another question [What factors contribute to the expense of migrating to Linux?](https://unix.stackexchange.com/questions/47898/what-factors-contribute-to-the-expense-of-migrating-to-linux) and intended to delete the old one. Then the new one was marked as a duplicate (of course it is, because is improvement of the old poorly asked question).

In the commentary to duplicate closure is written *answers may be merged with another identical question*. How do I do that?