Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 7 1/7
121 - 507 is -14921.
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Related: 2/21-50/7 1/42-50/7 1/21-50/14 3/21-50/7 1/63-50/7 1/21-50/21 5/21-50/7 1/21-50/35 7/21-50/7 1/21-50/49
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