Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 2 0/7
121 - 147 is -4121.
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Related: 2/21-14/7 1/21-28/7 1/42-14/7 3/21-14/7 1/21-42/7 1/63-14/7 1/21-14/21 5/21-14/7 1/21-70/7 1/21-14/35 7/21-14/7 1/21-98/7 1/21-14/49
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