Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 5 4/9
1821 - 499 is -28963.
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Related: 36/21-49/9 18/21-98/9 18/42-49/9 18/21-49/18 54/21-49/9 18/63-49/9 18/21-49/27 90/21-49/9 18/21-49/45 18/21-49/63
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