Solutions by everydaycalculation.com
930 - 1530 is -15.
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Related: 18/30-15/30 9/60-15/30 9/30-15/60 27/30-15/30 9/30-45/30 9/90-15/30 9/30-15/90 45/30-15/30 9/30-75/30 63/30-15/30
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