Solutions by everydaycalculation.com
1st number: 6/8, 2nd number: 2 0/4
68 - 84 is -54.
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Related: 12/8-8/4 6/8-16/4 6/16-8/4 18/8-8/4 6/8-24/4 6/24-8/4 6/8-8/12 30/8-8/4 6/8-40/4 6/40-8/4 6/8-8/20 42/8-8/4 6/8-56/4 6/56-8/4 6/8-8/28
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