2 4/5:21/20-1/3=2 1/3
2 4/5:21/20=14/5:21/20=(14*20)/5*21=8/3
8/3-1/3=7/3=2 1/3
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2 4/5:21/20-1/3=2 1/3
2 4/5:21/20=14/5:21/20=(14*20)/5*21=8/3
8/3-1/3=7/3=2 1/3