Solutions by everydaycalculation.com
1st number: 7/21, 2nd number: 1 1/7
721 - 87 is -1721.
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Related: 14/21-8/7 7/21-16/7 7/42-8/7 7/21-8/14 7/21-24/7 7/63-8/7 7/21-8/21 35/21-8/7 7/21-40/7 7/21-8/35 49/21-8/7 7/21-56/7 7/21-8/49
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