Solutions by everydaycalculation.com
1st number: 20/30, 2nd number: 1 5/30
2030 - 3530 is -12.
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Related: 40/30-35/30 20/30-70/30 20/60-35/30 20/30-35/60 60/30-35/30 20/90-35/30 20/30-35/90
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