Solutions by everydaycalculation.com
1st number: 7 3/6, 2nd number: 10 4/6
456 - 646 is -196.
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Related: 90/6-64/6 45/12-64/6 45/6-64/12 45/18-64/6 45/6-64/18 45/30-64/6 45/6-64/30 45/42-64/6 45/6-64/42
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