Solutions by everydaycalculation.com
1st number: 8/30, 2nd number: 1 12/30
830 - 4230 is -1715.
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Related: 16/30-42/30 8/30-84/30 8/60-42/30 8/30-42/60 24/30-42/30 8/90-42/30 8/30-42/90 40/30-42/30 56/30-42/30
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