Solutions by everydaycalculation.com
1st number: 6/40, 2nd number: 2 18/40
640 - 9840 is -2310.
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Related: 12/40-98/40 6/80-98/40 6/40-98/80 18/40-98/40 30/40-98/40 42/40-98/40
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