Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 5 5/6
1821 - 356 is -20942.
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Related: 36/21-35/6 18/21-70/6 18/42-35/6 18/21-35/12 54/21-35/6 18/63-35/6 18/21-35/18 90/21-35/6 18/21-35/30 18/21-35/42
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