Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 14/21
121 - 3521 is -3421.
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Related: 2/21-35/21 1/21-70/21 1/42-35/21 1/21-35/42 3/21-35/21 1/63-35/21 1/21-35/63 5/21-35/21 7/21-35/21
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