Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 1 14/21
1821 - 3521 is -1721.
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Related: 36/21-35/21 18/21-70/21 18/42-35/21 18/21-35/42 54/21-35/21 18/63-35/21 18/21-35/63 90/21-35/21
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