Solutions by everydaycalculation.com
15 - 67 is -2335.
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Related: 2/5-6/7 1/5-12/7 1/10-6/7 1/5-6/14 3/5-6/7 1/5-18/7 1/15-6/7 1/5-6/21 1/5-30/7 1/25-6/7 1/5-6/35 7/5-6/7 1/5-42/7 1/35-6/7 1/5-6/49
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