In this question and many others which I have seen, the question is an exact copy with little changes to itself on quora or other sites. I left a comment on the post with reference to the quora post, however, IMHO, the OP could have done that themselves. Should we be more harsh on this? I am sure that many others have also faced this issue. After all , a simple search can provide an answer to a question. I believe that it is good if they(Referencing to everyone in general) try to find their question on the internet and if they do not understand the solution given, then ask it here with reference to the other website which they have seen that potential solution. If they do not do as such, I think that that is either down to laziness or negligence. Which is something that I am guilty of as well and must improve on.
I also think that if the community does emphasise this more, the chances of questions being answered in the comments will definitely decrease. Furthermore, I think that we should extend the duplicate functionality to websites like quora or AoPS . Let me know your thoughts.