Solutions by everydaycalculation.com
1st number: 24/30, 2nd number: 2 24/30
2430 - 8430 is -21.
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Related: 48/30-84/30 24/60-84/30 24/30-84/60 72/30-84/30 24/90-84/30 24/30-84/90
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