721 - 224 + 63 = 560
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12 7/8 - 3 6/7 convert 12 7/8 to 103/8 convert 3 6/7 to 27/7 find lowest common denominator = 56 7(103) minus 8 ( 27) all divided by 56 (721 - 216) / 56 = 505/56 = 9.018
0.0055
375 +346 = 721
7% of 721 = 50.47
672 + 49 = 721