Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 7/21
3521 + 721 is 21.
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Related: 70/21+7/21 35/21+14/21 35/42+7/21 35/21+7/42 35/63+7/21 35/21+7/63 35/21+35/21 35/21+49/21
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