Solutions by everydaycalculation.com
1528 - 1828 is -328.
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Related: 30/28-18/28 15/28-36/28 15/56-18/28 15/28-18/56 45/28-18/28 15/28-54/28 15/84-18/28 15/28-18/84 75/28-18/28 15/28-90/28
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