I've marked question as duplicate. But then I understand that it is not total duplicate but I can't revote, I can't remove my vote
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I do have faced this problem for few times, however it seems that for closing a question, you will need 4 more users to agree to your vote anyway. So this should not be a real issue since you have voted it to be closed as duplicate but if the question does not get 4 more votes, it will still stay open meaning your vote will be void.