Solutions by everydaycalculation.com
1st number: 1/3, 2nd number: 7 1/7
13 - 507 is -14321.
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Related: 2/3-50/7 1/6-50/7 1/3-50/14 1/9-50/7 1/3-50/21 5/3-50/7 1/15-50/7 1/3-50/35 7/3-50/7 1/21-50/7 1/3-50/49
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