Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 1 8/10
1230 - 1810 is -75.
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Related: 24/30-18/10 12/30-36/10 12/60-18/10 12/30-18/20 36/30-18/10 12/30-54/10 12/90-18/10 12/30-18/30 60/30-18/10 12/30-90/10 12/30-18/50 84/30-18/10 12/30-18/70
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