Solutions by everydaycalculation.com
1st number: 2 4/6, 2nd number: 12/18
166 - 1218 is 21.
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Related: 32/6-12/18 16/6-24/18 16/12-12/18 16/6-12/36 48/6-12/18 16/6-36/18 16/18-12/18 16/6-12/54 80/6-12/18 16/6-60/18 16/30-12/18 16/6-12/90 16/6-84/18 16/42-12/18
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