simplify, 6+3-3-3-3-3-21-5-5234-534-5-4-4-3-43-3-443--4-4-4-4--4-4-4-4-4-4-4--44-4--4-4-4=5647765865886*556386588668*56586856853*68565*38566583*65833658*3856*3865*586*5368*3568*386*8563*8536*8563*8356*865*8653*8653*865*86358*3^345563265626434522466542254