Solutions by everydaycalculation.com
1st number: 7/20, 2nd number: 3 6/7
720 - 277 is -491140.
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Related: 14/20-27/7 7/20-54/7 7/40-27/7 7/20-27/14 21/20-27/7 7/20-81/7 7/60-27/7 7/20-27/21 35/20-27/7 7/20-27/35 49/20-27/7 7/20-27/49
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