Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 3/15
121 - 1815 is -121105.
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Related: 2/21-18/15 1/21-36/15 1/42-18/15 1/21-18/30 3/21-18/15 1/21-54/15 1/63-18/15 1/21-18/45 5/21-18/15 1/21-90/15 1/21-18/75 7/21-18/15
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