Solutions by everydaycalculation.com
67 - 79 is 563.
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Related: 12/7-7/9 6/7-14/9 6/14-7/9 6/7-7/18 18/7-7/9 6/7-21/9 6/21-7/9 6/7-7/27 30/7-7/9 6/7-35/9 6/35-7/9 6/7-7/45 42/7-7/9 6/7-49/9 6/49-7/9 6/7-7/63
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