Solutions by everydaycalculation.com
15 - 47 is -1335.
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Related: 2/5-4/7 1/5-8/7 1/10-4/7 1/5-4/14 3/5-4/7 1/5-12/7 1/15-4/7 1/5-4/21 1/5-20/7 1/25-4/7 1/5-4/35 7/5-4/7 1/5-28/7 1/35-4/7 1/5-4/49
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