Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 1 1/7
3521 - 87 is 1121.
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Related: 70/21-8/7 35/21-16/7 35/42-8/7 35/21-8/14 35/21-24/7 35/63-8/7 35/21-8/21 35/21-40/7 35/21-8/35 35/21-56/7 35/21-8/49
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