* Dow falls 0.4%, S&P flat, Nasdaq rebounds 0.7% 
  * European stocks boosted by upbeat earnings 
  * China blue-chip index closes up 0.2% 
  * Yuan edges back from three-month lows 
  * Dollar softens 
  By Koh Gui Qing 
  NEW YORK, July 28 (Reuters) -…

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