Solutions by everydaycalculation.com
1st number: 3/10, 2nd number: 9 1/7
310 - 647 is -61970.
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Related: 6/10-64/7 3/20-64/7 3/10-64/14 9/10-64/7 3/30-64/7 3/10-64/21 15/10-64/7 3/50-64/7 3/10-64/35 21/10-64/7 3/70-64/7 3/10-64/49
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