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b) 10 7/20 - 13/20 = 9 27/20 - 13/20 = 9 14/20 = 9 7/10
c) 5 5/9 - 2 8/9 = 4 14/9 - 2 8/9 = 2 6/9 = 2 2/3
d) 7 1/6 - 3 5/6 = 6 7/6 - 3 5/6 = 3 2/6 = 3 1/3
e) 6 9/23 - 21/23 = 5 32/23 - 21/23 = 5 11/23
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