Solutions by everydaycalculation.com
121 - 621 is -521.
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Related: 2/21-6/21 1/21-12/21 1/42-6/21 1/21-6/42 3/21-6/21 1/21-18/21 1/63-6/21 1/21-6/63 5/21-6/21 1/21-30/21 7/21-6/21 1/21-42/21
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