Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 2 1/7
121 - 157 is -4421.
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Related: 2/21-15/7 1/21-30/7 1/42-15/7 1/21-15/14 3/21-15/7 1/21-45/7 1/63-15/7 1/21-15/21 5/21-15/7 1/21-75/7 1/21-15/35 7/21-15/7 1/21-15/49
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