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= (18/33 - 11/33)/(3 10/15 - 2 3/15) * 2 3/4 = 7/33 : 1 7/15 * 2 3/4 =
= 7/33 : 22/15 * 11/4 = 7/33 : 242/60 = 7/33 * 60/242 = 7/11 * 20/242 =
= 7/11 * 10/121 = 70/1331