Solutions by everydaycalculation.com
1st number: 6 4/10, 2nd number: 9 0/10
6410 - 9010 is -135.
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Related: 64/20-90/10 64/10-90/20 64/30-90/10 64/10-90/30 64/50-90/10 64/10-90/50 64/70-90/10 64/10-90/70
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