Solutions by everydaycalculation.com
1st number: 15/21, 2nd number: 4 1/6
1521 - 256 is -14542.
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Related: 30/21-25/6 15/21-50/6 15/42-25/6 15/21-25/12 45/21-25/6 15/21-75/6 15/63-25/6 15/21-25/18 75/21-25/6 15/21-25/30 15/21-25/42
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