Solutions by everydaycalculation.com
1st number: 21/40, 2nd number: 1 8/10
2140 - 1810 is -5140.
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Related: 42/40-18/10 21/40-36/10 21/80-18/10 21/40-18/20 63/40-18/10 21/40-54/10 21/40-18/30 21/40-90/10 21/40-18/50 21/40-18/70
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