Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 1 24/30
1230 - 5430 is -75.
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Related: 24/30-54/30 12/60-54/30 12/30-54/60 36/30-54/30 12/90-54/30 12/30-54/90 60/30-54/30 84/30-54/30
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