Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 5 0/7
121 - 357 is -10421.
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Related: 2/21-35/7 1/21-70/7 1/42-35/7 1/21-35/14 3/21-35/7 1/63-35/7 1/21-35/21 5/21-35/7 7/21-35/7 1/21-35/49
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