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