Solutions by everydaycalculation.com
1st number: 18/30, 2nd number: 1 15/30
1830 - 4530 is -910.
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Related: 36/30-45/30 18/30-90/30 18/60-45/30 18/30-45/60 54/30-45/30 18/90-45/30 18/30-45/90 90/30-45/30
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