Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 1/7
1621 - 87 is -821.
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Related: 32/21-8/7 16/21-16/7 16/42-8/7 16/21-8/14 48/21-8/7 16/21-24/7 16/63-8/7 16/21-8/21 80/21-8/7 16/21-40/7 16/21-8/35 16/21-56/7 16/21-8/49
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