Solutions by everydaycalculation.com
1st number: 6/15, 2nd number: 1 8/10
615 - 1810 is -75.
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Related: 12/15-18/10 6/15-36/10 6/30-18/10 6/15-18/20 18/15-18/10 6/15-54/10 6/45-18/10 6/15-18/30 30/15-18/10 6/15-90/10 6/75-18/10 6/15-18/50 42/15-18/10 6/15-18/70
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