Solutions by everydaycalculation.com
1st number: 6/70, 2nd number: 1 5/10
670 - 1510 is -9970.
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Related: 12/70-15/10 6/70-30/10 6/70-15/20 18/70-15/10 6/70-45/10 6/70-15/30 30/70-15/10 6/70-75/10 6/70-15/50 42/70-15/10 6/70-15/70
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