Solutions by everydaycalculation.com
1421 - 1821 is -421.
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Related: 28/21-18/21 14/21-36/21 14/42-18/21 14/21-18/42 42/21-18/21 14/21-54/21 14/63-18/21 14/21-18/63 70/21-18/21 14/21-90/21 98/21-18/21
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