Solutions by everydaycalculation.com
1st number: 2/3, 2nd number: 7 1/7
23 - 507 is -13621.
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Related: 4/3-50/7 2/6-50/7 2/3-50/14 6/3-50/7 2/9-50/7 2/3-50/21 10/3-50/7 2/15-50/7 2/3-50/35 14/3-50/7 2/21-50/7 2/3-50/49
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