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63/14 - 59/14 = 4/14 = 2/7
b) 3 2/15 - ( 1 3/10 + 4 3/20) = 47/15 - (13/10 + 83/20) = 47/15 - (26/20 + 83/20) =
47/15 - 109/20 = 188/60 - 327/60 = -139/60 = -2 19/60
c) 2 1/8 - ( 1 2/7 - 3 1/28) = 17/8 - (9/7 - 85/28) = 17/8 - (36/28 - 85/28) =
17/8 - (-49/28) = 17/8 + 7/4 = 17/8 + 14/8 = 31/8 = 3 7/8