Solutions by everydaycalculation.com
1st number: 1 6/30, 2nd number: 1 12/30
3630 - 4230 is -15.
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Related: 72/30-42/30 36/30-84/30 36/60-42/30 36/30-42/60 36/90-42/30 36/30-42/90
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