Solutions by everydaycalculation.com
1821 - 121 is 1721.
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Related: 36/21-1/21 18/21-2/21 18/42-1/21 18/21-1/42 54/21-1/21 18/21-3/21 18/63-1/21 18/21-1/63 90/21-1/21 18/21-5/21 18/21-7/21
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