Solutions by everydaycalculation.com
1st number: 28/30, 2nd number: 2 10/30
2830 - 7030 is -75.
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Related: 56/30-70/30 28/60-70/30 28/30-70/60 84/30-70/30 28/90-70/30 28/30-70/90
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