Solutions by everydaycalculation.com
1st number: 6/12, 2nd number: 3 9/12
612 - 4512 is -134.
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Related: 6/12-90/12 6/24-45/12 6/12-45/24 18/12-45/12 6/36-45/12 6/12-45/36 30/12-45/12 6/60-45/12 6/12-45/60 42/12-45/12 6/84-45/12 6/12-45/84
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