Solutions by everydaycalculation.com
830 - 130 is 730.
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Related: 16/30-1/30 8/30-2/30 8/60-1/30 8/30-1/60 24/30-1/30 8/30-3/30 8/90-1/30 8/30-1/90 40/30-1/30 8/30-5/30 56/30-1/30 8/30-7/30
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