Solutions by everydaycalculation.com
121 - 2021 is -1921.
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Related: 2/21-20/21 1/21-40/21 1/42-20/21 1/21-20/42 3/21-20/21 1/21-60/21 1/63-20/21 1/21-20/63 5/21-20/21 7/21-20/21
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