Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 6/15
121 - 2115 is -142105.
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Related: 2/21-21/15 1/21-42/15 1/42-21/15 1/21-21/30 3/21-21/15 1/21-63/15 1/63-21/15 1/21-21/45 5/21-21/15 1/21-21/75 7/21-21/15
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