Solutions by everydaycalculation.com
1st number: 24/30, 2nd number: 1 10/30
2430 - 4030 is -815.
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Related: 48/30-40/30 24/30-80/30 24/60-40/30 24/30-40/60 72/30-40/30 24/90-40/30 24/30-40/90
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