Solutions by everydaycalculation.com
1st number: 6/21, 2nd number: 3 7/21
621 - 7021 is -6421.
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Related: 12/21-70/21 6/42-70/21 6/21-70/42 18/21-70/21 6/63-70/21 6/21-70/63 30/21-70/21 42/21-70/21
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