Joel Embiid and Tyrese Maxey each notched at least 30 points, 11 rebounds and six assists to power the Sixers to win Game 7 in Boston, completing a 3-1 series comeback against the Celtics and advancing to the Eastern Conference Semifinals. Here are six thoughts on Game 7. Embiid's masterpiece The big man came out firing in this game. But not in the way he did in Games 4 through 6, when he burned some possessions trying to shoot his way out of a 3-point slump. In this game, Embiid came out and immediately stuck an elbow jumper in the two-man game. He dominated the first half, amassing jumpers out of the post and on the move trailing Maxey in the pick-and-short-roll. But just as Embiid did in Game 6, he orchestrated the offense, using Boston's defense against them. He helped amplify the team's pace in transition instead of slowing the offense down to walk his way into position, making quick passes ahead to V.J. Edgecombe and Maxey early on.…