Solutions by everydaycalculation.com
1st number: 28/30, 2nd number: 1 10/30
2830 - 4030 is -25.
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Related: 56/30-40/30 28/30-80/30 28/60-40/30 28/30-40/60 84/30-40/30 28/90-40/30 28/30-40/90
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