(21/8) - (3/4) = (21/8) - (6/8) = 15/8 = 1-7/8 = 1.875
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5/21
87/21 - 73/21 = 14/21 = 2/3
19/21 - 4/12 (4/12 = 1/3) = 12/21Convert the 1/3 into 7/21 and subtract.
6/7 - 2/3 = 18/21 - 14/21 = 4/21
13/21 - 7/21 = 6/21 Sorry, DJ, 4 over 7 = 12/21 so answer is 5/21