Solutions by everydaycalculation.com
828 - 428 is 17.
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Related: 16/28-4/28 8/28-8/28 8/56-4/28 8/28-4/56 24/28-4/28 8/28-12/28 8/84-4/28 8/28-4/84 40/28-4/28 8/28-20/28 56/28-4/28
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