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I agree with Misha Kapovitch. This user (balan-antoine) is quite a repeat-offender in addition see for example in http://tea.mathoverflow.net/discussion/1430/1/spam/ and there were other issues too. (I flagged the question for mod-attention a while ago, motivated by the now gone comments.) And the last "answer" seems even worse.
We're on it. Please contact us directly if you notice alternative accounts show up in the interim.
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