PHILADELPHIA — James Harden hit two three-pointers and had a driving layup in the final four minutes against his former Brooklyn teammates and the Philadelphia 76ers stretched their winning streak to six games, outscoring the Nets 137-133 on Wednesday night. Tyrese Maxey led the 76ers with 27 points, and Joel Embiid had 26. Harden added 23, and Philadelphia was 35 of 36 from the foul line. Seth Curry had a season-high 32 points for Brooklyn. Kyrie Irving had 30 for the Nets, who have lost five of the last seven games without Kevin Durant. The game was the first regular-season…