Solutions by everydaycalculation.com
23 - 57 is -121.
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Related: 4/3-5/7 2/3-10/7 2/6-5/7 2/3-5/14 6/3-5/7 2/3-15/7 2/9-5/7 2/3-5/21 10/3-5/7 2/3-25/7 2/15-5/7 2/3-5/35 14/3-5/7 2/3-35/7 2/21-5/7 2/3-5/49
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