Solutions by everydaycalculation.com
1st number: 15/21, 2nd number: 5 5/6
1521 - 356 is -21542.
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Related: 30/21-35/6 15/21-70/6 15/42-35/6 15/21-35/12 45/21-35/6 15/63-35/6 15/21-35/18 75/21-35/6 15/21-35/30 15/21-35/42
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