Solutions by everydaycalculation.com
821 - 712 is -1784.
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Related: 16/21-7/12 8/21-14/12 8/42-7/12 8/21-7/24 24/21-7/12 8/21-21/12 8/63-7/12 8/21-7/36 40/21-7/12 8/21-35/12 8/21-7/60 56/21-7/12 8/21-49/12 8/21-7/84
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