Solutions by everydaycalculation.com
23 - 56 is -16.
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Related: 4/3-5/6 2/3-10/6 2/6-5/6 2/3-5/12 6/3-5/6 2/3-15/6 2/9-5/6 2/3-5/18 10/3-5/6 2/3-25/6 2/15-5/6 2/3-5/30 14/3-5/6 2/3-35/6 2/21-5/6 2/3-5/42
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