Solutions by everydaycalculation.com
1221 - 1421 is -221.
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Related: 24/21-14/21 12/21-28/21 12/42-14/21 12/21-14/42 36/21-14/21 12/21-42/21 12/63-14/21 12/21-14/63 60/21-14/21 12/21-70/21 84/21-14/21 12/21-98/21
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