Solutions by everydaycalculation.com
1st number: 2 4/6, 2nd number: 8/12
166 - 812 is 21.
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Related: 32/6-8/12 16/6-16/12 16/12-8/12 16/6-8/24 48/6-8/12 16/6-24/12 16/18-8/12 16/6-8/36 80/6-8/12 16/6-40/12 16/30-8/12 16/6-8/60 16/6-56/12 16/42-8/12 16/6-8/84
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