Solutions by everydaycalculation.com
1st number: 21/40, 2nd number: 1 5/10
2140 - 1510 is -3940.
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Related: 42/40-15/10 21/40-30/10 21/80-15/10 21/40-15/20 63/40-15/10 21/40-45/10 21/40-15/30 21/40-75/10 21/40-15/50 21/40-15/70
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