Solutions by everydaycalculation.com
821 - 27 is 221.
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Related: 16/21-2/7 8/21-4/7 8/42-2/7 8/21-2/14 24/21-2/7 8/21-6/7 8/63-2/7 8/21-2/21 40/21-2/7 8/21-10/7 8/21-2/35 56/21-2/7 8/21-14/7 8/21-2/49
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