Solutions by everydaycalculation.com
1st number: 21/30, 2nd number: 1 18/30
2130 - 4830 is -910.
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Related: 42/30-48/30 21/30-96/30 21/60-48/30 21/30-48/60 63/30-48/30 21/90-48/30 21/30-48/90
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