Solutions by everydaycalculation.com
2128 - 728 is 12.
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Related: 42/28-7/28 21/28-14/28 21/56-7/28 21/28-7/56 63/28-7/28 21/28-21/28 21/84-7/28 21/28-7/84 21/28-35/28 21/28-49/28
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