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4 4/3 - 2/3 = 4 2/3
b) 2 1/3 : 6/7 + 4 1/2 * 2 2/3 - (3/4+1/6): 11/15= 7/3*7/6 + 9/2*8/3 - (9/12+2/12): 11/15= 2 13/18 + 12 - 11/12:11/15= 14 13/18 - 11/12*15/11= 14 13/18 - 1 1/4 =
14 26/36 - 1 9/36 = 13 17/36