Solutions by everydaycalculation.com
1st number: 20/30, 2nd number: 1 20/30
2030 - 5030 is -11.
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Related: 40/30-50/30 20/60-50/30 20/30-50/60 60/30-50/30 20/90-50/30 20/30-50/90
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