Solutions by everydaycalculation.com
1st number: 5/21, 2nd number: 3 3/6
521 - 216 is -13742.
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Related: 10/21-21/6 5/21-42/6 5/42-21/6 5/21-21/12 15/21-21/6 5/21-63/6 5/63-21/6 5/21-21/18 25/21-21/6 5/21-21/30 35/21-21/6 5/21-21/42
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