Solutions by everydaycalculation.com
821 - 56 is -1942.
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Related: 16/21-5/6 8/21-10/6 8/42-5/6 8/21-5/12 24/21-5/6 8/21-15/6 8/63-5/6 8/21-5/18 40/21-5/6 8/21-25/6 8/21-5/30 56/21-5/6 8/21-35/6 8/21-5/42
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