Solutions by everydaycalculation.com
1st number: 8/10, 2nd number: 1 8/10
810 - 1810 is -11.
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Related: 16/10-18/10 8/10-36/10 8/20-18/10 8/10-18/20 24/10-18/10 8/10-54/10 8/30-18/10 8/10-18/30 40/10-18/10 8/10-90/10 8/50-18/10 8/10-18/50 56/10-18/10 8/70-18/10 8/10-18/70
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