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a) 6 7/9 - 2/3=6 7/9 - 6/9=6 1/9
b) 6 7/9 - 7/8=6 56/72-49/72=6 7/72
c) 1 1/2-5/7=1 7/14-10/14= 11/14
d) 7 3/4 - 5 4/5=7 15/20 - 5 16/20=1 19/20
e) 9 3/5-4 2/3=9 9/15 - 4 10/15=4 14/15