Solutions by everydaycalculation.com
1st number: 20/30, 2nd number: 2 10/30
2030 - 7030 is -53.
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Related: 40/30-70/30 20/60-70/30 20/30-70/60 60/30-70/30 20/90-70/30 20/30-70/90
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