Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 2 4/7
121 - 187 is -5321.
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Related: 2/21-18/7 1/21-36/7 1/42-18/7 1/21-18/14 3/21-18/7 1/21-54/7 1/63-18/7 1/21-18/21 5/21-18/7 1/21-90/7 1/21-18/35 7/21-18/7 1/21-18/49
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