Solutions by everydaycalculation.com
821 - 1621 is -821.
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Related: 16/21-16/21 8/21-32/21 8/42-16/21 8/21-16/42 24/21-16/21 8/21-48/21 8/63-16/21 8/21-16/63 40/21-16/21 8/21-80/21 56/21-16/21
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