Solutions by everydaycalculation.com
1st number: 10 0/4, 2nd number: 10 2/4
404 - 424 is -12.
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Related: 80/4-42/4 40/4-84/4 40/8-42/4 40/4-42/8 40/12-42/4 40/4-42/12 40/20-42/4 40/4-42/20 40/28-42/4 40/4-42/28
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