Solutions by everydaycalculation.com
1421 - 27 is 821.
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Related: 28/21-2/7 14/21-4/7 14/42-2/7 14/21-2/14 42/21-2/7 14/21-6/7 14/63-2/7 14/21-2/21 70/21-2/7 14/21-10/7 14/21-2/35 98/21-2/7 14/21-14/7 14/21-2/49
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