Solutions by everydaycalculation.com
1st number: 8/10, 2nd number: 2 8/10
810 - 2810 is -21.
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Related: 16/10-28/10 8/10-56/10 8/20-28/10 8/10-28/20 24/10-28/10 8/10-84/10 8/30-28/10 8/10-28/30 40/10-28/10 8/50-28/10 8/10-28/50 56/10-28/10 8/70-28/10 8/10-28/70
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