Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 3 0/21
1821 - 6321 is -157.
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Related: 36/21-63/21 18/42-63/21 18/21-63/42 54/21-63/21 18/63-63/21 90/21-63/21
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