Solutions by everydaycalculation.com
1st number: 21/30, 2nd number: 2 20/30
2130 - 8030 is -5930.
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Related: 42/30-80/30 21/60-80/30 21/30-80/60 63/30-80/30 21/90-80/30 21/30-80/90
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