Solutions by everydaycalculation.com
1st number: 1 12/30, 2nd number: 1 18/30
4230 - 4830 is -15.
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Related: 84/30-48/30 42/30-96/30 42/60-48/30 42/30-48/60 42/90-48/30 42/30-48/90
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