Solutions by everydaycalculation.com
1421 - 37 is 521.
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Related: 28/21-3/7 14/21-6/7 14/42-3/7 14/21-3/14 42/21-3/7 14/21-9/7 14/63-3/7 14/21-3/21 70/21-3/7 14/21-15/7 14/21-3/35 98/21-3/7 14/21-21/7 14/21-3/49
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