Solutions by everydaycalculation.com
1st number: 16/70, 2nd number: 1 5/10
1670 - 1510 is -8970.
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Related: 32/70-15/10 16/70-30/10 16/70-15/20 48/70-15/10 16/70-45/10 16/70-15/30 80/70-15/10 16/70-75/10 16/70-15/50 16/70-15/70
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