Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 3 12/21
1821 - 7521 is -197.
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Related: 36/21-75/21 18/42-75/21 18/21-75/42 54/21-75/21 18/63-75/21 18/21-75/63 90/21-75/21
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