Solutions by everydaycalculation.com
112 - 512 is -13.
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Related: 2/12-5/12 1/12-10/12 1/24-5/12 1/12-5/24 3/12-5/12 1/12-15/12 1/36-5/12 1/12-5/36 5/12-5/12 1/12-25/12 1/60-5/12 1/12-5/60 7/12-5/12 1/12-35/12 1/84-5/12 1/12-5/84
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