Solutions by everydaycalculation.com
14 - 67 is -1728.
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Related: 2/4-6/7 1/4-12/7 1/8-6/7 1/4-6/14 3/4-6/7 1/4-18/7 1/12-6/7 1/4-6/21 5/4-6/7 1/4-30/7 1/20-6/7 1/4-6/35 7/4-6/7 1/4-42/7 1/28-6/7 1/4-6/49
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