Solutions by everydaycalculation.com
821 - 89 is -3263.
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Related: 16/21-8/9 8/21-16/9 8/42-8/9 8/21-8/18 24/21-8/9 8/21-24/9 8/63-8/9 8/21-8/27 40/21-8/9 8/21-40/9 8/21-8/45 56/21-8/9 8/21-56/9 8/21-8/63
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