Solutions by everydaycalculation.com
1st number: 18/30, 2nd number: 1 12/30
1830 - 4230 is -45.
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Related: 36/30-42/30 18/30-84/30 18/60-42/30 18/30-42/60 54/30-42/30 18/90-42/30 18/30-42/90 90/30-42/30
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