Solutions by everydaycalculation.com
1st number: 12/21, 2nd number: 1 9/21
1221 - 3021 is -67.
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Related: 24/21-30/21 12/21-60/21 12/42-30/21 12/21-30/42 36/21-30/21 12/21-90/21 12/63-30/21 12/21-30/63 60/21-30/21 84/21-30/21
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