Solutions by everydaycalculation.com
1st number: 16 0/4, 2nd number: 14 0/4
644 - 564 is 21.
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Related: 64/8-56/4 64/4-56/8 64/12-56/4 64/4-56/12 64/20-56/4 64/4-56/20 64/28-56/4 64/4-56/28
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