At the end of the day, the user is asking us to explain the answer to a question that has already been asked. In cases such as the example you have provided, they directly repeat the original question.
I would be closing these questions immediately, especially when the duplication is so clear and obvious. That does not mean we can not help the user.
You could advise them to post a bounty on the original question to draw out an answer they could better understand. Heck, if you want to help them out, you could do this, yourself. This is the intended way to encourage newer answers; not by ignoring the duplication standards we try to keep.
What if the user can not afford the bounty?
It only costs 50 reputation to place a bounty, and you only need 75 reputation to earn the privilege, in the first place. While you are free to place the bounty, yourself, the cost seems fairly reasonable for a new user wishing to seek explicit help.
What if the user does not want to post a bounty?
If the user does not wish to post a bounty, they are not too invested in receiving an answer. Simple as that. If you think other users might still benefit from an updated answer, consider posting the bounty, yourself.
I have read the original answers, and none of them cover the topic very well.
If you have the understanding and knowledge to provide a better quality answer, you should post it on the original question. We want all the relevant answers in the same place. If the new question is closed, it will still redirect to the old question. In cases such as these, had the original featured the rsought after explanation, the user surely would not have posted in the first place.
But the user really isn't understanding
Remember that we are a Q&A site; not a HowTo guide. There is going to be a certain level where users simply do not understand the context, and at that point, you have to accept that we can't help everyone. Maybe it's worth exploring why the user does not understand.
Talk to them, in chat, and discuss their confusion. This might come down to obvious falts in the original answers, providing you with feedback to create a better answer. This might also come down to jumping to far ahead, where you might be better off advising the user to learn less advanced concepts, first.