Solutions by everydaycalculation.com
1st number: 8/90, 2nd number: 1 5/10
890 - 1510 is -12790.
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Related: 16/90-15/10 8/90-30/10 8/90-15/20 24/90-15/10 8/90-45/10 8/90-15/30 40/90-15/10 8/90-75/10 8/90-15/50 56/90-15/10 8/90-15/70
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