Solutions by everydaycalculation.com
821 - 312 is 1184.
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Related: 16/21-3/12 8/21-6/12 8/42-3/12 8/21-3/24 24/21-3/12 8/21-9/12 8/63-3/12 8/21-3/36 40/21-3/12 8/21-15/12 8/21-3/60 56/21-3/12 8/21-21/12 8/21-3/84
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