Solutions by everydaycalculation.com
1030 - 1530 is -16.
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Related: 20/30-15/30 10/60-15/30 10/30-15/60 10/30-45/30 10/90-15/30 10/30-15/90 50/30-15/30 10/30-75/30 70/30-15/30
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