Solutions by everydaycalculation.com
1st number: 6 0/3, 2nd number: 5/21
183 + 521 is 13121.
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Related: 36/3+5/21 18/3+10/21 18/6+5/21 18/3+5/42 54/3+5/21 18/3+15/21 18/9+5/21 18/3+5/63 90/3+5/21 18/3+25/21 18/15+5/21 18/3+35/21 18/21+5/21
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