Solutions by everydaycalculation.com
1st number: 3 0/6, 2nd number: 3 3/6
186 - 216 is -12.
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Related: 36/6-21/6 18/6-42/6 18/12-21/6 18/6-21/12 54/6-21/6 18/6-63/6 18/6-21/18 90/6-21/6 18/30-21/6 18/6-21/30 18/42-21/6 18/6-21/42
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