You've Got Trouble

This brain teaser spells trouble. Each letter in the word "trouble" stands for 1, 3, 4, 5, 6, 8, 9 Clues: T + T = R O + O = UR T  x T =  UL O x O = RU T + O = UB T x O = BL Question : What is the value of each letter? Answer : T = 4,  R = 8,  O = 9,  U = 1,  B = 3,  L = 6,  E = 5