Solutions by everydaycalculation.com
13 - 25 is -115.
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Related: 2/3-2/5 1/3-4/5 1/6-2/5 1/3-2/10 1/3-6/5 1/9-2/5 1/3-2/15 5/3-2/5 1/3-10/5 1/15-2/5 1/3-2/25 7/3-2/5 1/3-14/5 1/21-2/5 1/3-2/35
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