Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 2 6/7
3521 - 207 is -2521.
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Related: 70/21-20/7 35/21-40/7 35/42-20/7 35/21-20/14 35/21-60/7 35/63-20/7 35/21-20/21 35/21-20/35 35/21-20/49
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