Solutions by everydaycalculation.com
1421 - 1521 is -121.
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Related: 28/21-15/21 14/21-30/21 14/42-15/21 14/21-15/42 42/21-15/21 14/21-45/21 14/63-15/21 14/21-15/63 70/21-15/21 14/21-75/21 98/21-15/21
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