Solutions by everydaycalculation.com
821 - 67 is -1021.
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Related: 16/21-6/7 8/21-12/7 8/42-6/7 8/21-6/14 24/21-6/7 8/21-18/7 8/63-6/7 8/21-6/21 40/21-6/7 8/21-30/7 8/21-6/35 56/21-6/7 8/21-42/7 8/21-6/49
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