Solutions by everydaycalculation.com
1st number: 12/40, 2nd number: 2 10/40
1240 - 9040 is -3920.
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Related: 24/40-90/40 12/80-90/40 12/40-90/80 36/40-90/40 60/40-90/40 84/40-90/40
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