Solutions by everydaycalculation.com
1st number: 1 5/10, 2nd number: 1 8/10
1510 - 1810 is -310.
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Related: 30/10-18/10 15/10-36/10 15/20-18/10 15/10-18/20 45/10-18/10 15/10-54/10 15/30-18/10 15/10-18/30 75/10-18/10 15/10-90/10 15/50-18/10 15/10-18/50 15/70-18/10 15/10-18/70
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