Behind 35 points from James, Cleveland beats Boston 87-79 in Game 7.
All-Star suffered concussion in first quarter of Game 6.
Cleveland shakes off losing Love behind 46 points by LeBron
Tatum, Horford guide Boston to 96-83 win, 3-2 edge in Eastern Conference finals.
Cleveland trails Eastern Conference finals, 2-1; Game 4 set for Monday.