Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 1 3/7
3521 - 107 is 521.
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Related: 70/21-10/7 35/21-20/7 35/42-10/7 35/21-10/14 35/21-30/7 35/63-10/7 35/21-10/21 35/21-50/7 35/21-10/35 35/21-70/7 35/21-10/49
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