Solutions by everydaycalculation.com
1524 - 1824 is -18.
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Related: 30/24-18/24 15/24-36/24 15/48-18/24 15/24-18/48 45/24-18/24 15/24-54/24 15/72-18/24 15/24-18/72 75/24-18/24 15/24-90/24
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