Solutions by everydaycalculation.com
1st number: 7/10, 2nd number: 1 2/10
710 - 1210 is -12.
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Related: 14/10-12/10 7/10-24/10 7/20-12/10 7/10-12/20 21/10-12/10 7/10-36/10 7/30-12/10 7/10-12/30 35/10-12/10 7/10-60/10 7/50-12/10 7/10-12/50 49/10-12/10 7/10-84/10 7/70-12/10 7/10-12/70
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