Solutions by everydaycalculation.com
1st number: 6/8, 2nd number: 1 8/10
68 - 1810 is -2120.
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Related: 12/8-18/10 6/8-36/10 6/16-18/10 6/8-18/20 18/8-18/10 6/8-54/10 6/24-18/10 6/8-18/30 30/8-18/10 6/8-90/10 6/40-18/10 6/8-18/50 42/8-18/10 6/56-18/10 6/8-18/70
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