Gallinari also provided eight rebounds and six assists.
Wilson Chandler came off the bench to provide 14 points for the Nuggets, who went on a 19-2 run to start the fourth quarter, erasing a six-point deficit.
Stephen Curry drained seven 3-pointers on his way to 29 points and distributed seven assists as the Warriors fell for the third time in four games.
David Lee supplied a double-double of 23 points and 13 rebounds and Harrison Barnes struck for 21 points for Golden State.
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