Solutions by everydaycalculation.com
1st number: 5/10, 2nd number: 1 2/10
510 - 1210 is -710.
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Related: 5/10-24/10 5/20-12/10 5/10-12/20 15/10-12/10 5/10-36/10 5/30-12/10 5/10-12/30 25/10-12/10 5/10-60/10 5/50-12/10 5/10-12/50 35/10-12/10 5/10-84/10 5/70-12/10 5/10-12/70
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