Solutions by everydaycalculation.com
1st number: 12/21, 2nd number: 2 12/21
1221 - 5421 is -21.
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Related: 24/21-54/21 12/42-54/21 12/21-54/42 36/21-54/21 12/63-54/21 12/21-54/63 60/21-54/21 84/21-54/21
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