Solutions by everydaycalculation.com
821 - 47 is -421.
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Related: 16/21-4/7 8/21-8/7 8/42-4/7 8/21-4/14 24/21-4/7 8/21-12/7 8/63-4/7 8/21-4/21 40/21-4/7 8/21-20/7 8/21-4/35 56/21-4/7 8/21-28/7 8/21-4/49
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