Solutions by everydaycalculation.com
1st number: 6/12, 2nd number: 2 6/12
612 - 3012 is -21.
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Related: 6/12-60/12 6/24-30/12 6/12-30/24 18/12-30/12 6/12-90/12 6/36-30/12 6/12-30/36 30/12-30/12 6/60-30/12 6/12-30/60 42/12-30/12 6/84-30/12 6/12-30/84
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