Solutions by everydaycalculation.com
1st number: 7/28, 2nd number: 1 1/7
728 + 87 is 3928.
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Related: 14/28+8/7 7/28+16/7 7/56+8/7 7/28+8/14 21/28+8/7 7/28+24/7 7/84+8/7 7/28+8/21 35/28+8/7 7/28+40/7 7/28+8/35 49/28+8/7 7/28+56/7 7/28+8/49
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