Solutions by everydaycalculation.com
1st number: 8/30, 2nd number: 1 10/30
830 - 4030 is -1615.
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Related: 16/30-40/30 8/30-80/30 8/60-40/30 8/30-40/60 24/30-40/30 8/90-40/30 8/30-40/90 40/30-40/30 56/30-40/30
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