Solutions by everydaycalculation.com
1st number: 1/70, 2nd number: 1 2/10
170 - 1210 is -8370.
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Related: 2/70-12/10 1/70-24/10 1/70-12/20 3/70-12/10 1/70-36/10 1/70-12/30 5/70-12/10 1/70-60/10 1/70-12/50 7/70-12/10 1/70-84/10 1/70-12/70
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