Solutions by everydaycalculation.com
1221 - 1621 is -421.
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Related: 24/21-16/21 12/21-32/21 12/42-16/21 12/21-16/42 36/21-16/21 12/21-48/21 12/63-16/21 12/21-16/63 60/21-16/21 12/21-80/21 84/21-16/21
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