Tried to come up with a 3 team trade that I think is reasonably fair for all 3 teams (not that I think it would ever happen).
Boston - Wall, Gortat
Washington - Mudiay, Hernangomez, Yabusele, Jerekbo, BKN 18, BOS 18
Denver - Thomas, Johnson
Boston upgrades the PG and C position making a win now type trade but without sacrificing too much of the future (though does give up all cap space next summer). Boston has 2 open roster spots after the trade as well.
Denver goes for the playoffs giving up youth for Thomas (and they still have Murray as a potential PG of the future).
Washington goes all in on the rebuild dumping Gortat's salary and picking up Mudiay, two 1sts from the prior draft, and two future 1sts including a BKN pick (while ensuring their own 1st this year is a lot better).