Solutions by everydaycalculation.com
1st number: 21/30, 2nd number: 2 10/30
2130 - 7030 is -4930.
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Related: 42/30-70/30 21/60-70/30 21/30-70/60 63/30-70/30 21/90-70/30 21/30-70/90
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