Solutions by everydaycalculation.com
1530 - 1830 is -110.
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Related: 15/30-36/30 15/60-18/30 15/30-18/60 45/30-18/30 15/30-54/30 15/90-18/30 15/30-18/90 75/30-18/30 15/30-90/30
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