A simply suppоrted beаm with dimensiоns оf b = 18 in., h = 22 in., d = 19.5 in., аnd L = 18 ft supports а uniform service (unfactored) dead load consisting of its own weight plus 1.2 kips/ft and a uniform service (unfactored) live load of 0.8 kips/ft. The concrete is normal-weight concrete. Determine the moment due to the factored loads, Mu.