Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 1 12/30
1230 - 4230 is -11.
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Related: 24/30-42/30 12/30-84/30 12/60-42/30 12/30-42/60 36/30-42/30 12/90-42/30 12/30-42/90 60/30-42/30 84/30-42/30
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