Solutions by everydaycalculation.com
2830 - 1230 is 815.
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Related: 56/30-12/30 28/30-24/30 28/60-12/30 28/30-12/60 84/30-12/30 28/30-36/30 28/90-12/30 28/30-12/90 28/30-60/30 28/30-84/30
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