Solutions by everydaycalculation.com
1st number: 14/28, 2nd number: 1 2/4
1428 + 64 is 21.
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Related: 14/28+12/4 14/56+6/4 14/28+6/8 42/28+6/4 14/28+18/4 14/84+6/4 14/28+6/12 70/28+6/4 14/28+30/4 14/28+6/20 98/28+6/4 14/28+42/4 14/28+6/28
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