Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 1 4/12
1230 - 1612 is -1415.
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Related: 24/30-16/12 12/30-32/12 12/60-16/12 12/30-16/24 36/30-16/12 12/30-48/12 12/90-16/12 12/30-16/36 60/30-16/12 12/30-80/12 12/30-16/60 84/30-16/12 12/30-16/84
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