Solutions by everydaycalculation.com
821 - 821 is 01.
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Related: 16/21-8/21 8/21-16/21 8/42-8/21 8/21-8/42 24/21-8/21 8/21-24/21 8/63-8/21 8/21-8/63 40/21-8/21 8/21-40/21 56/21-8/21 8/21-56/21
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