Solutions by everydaycalculation.com
1230 - 512 is -160.
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Related: 24/30-5/12 12/30-10/12 12/60-5/12 12/30-5/24 36/30-5/12 12/30-15/12 12/90-5/12 12/30-5/36 60/30-5/12 12/30-25/12 12/30-5/60 84/30-5/12 12/30-35/12 12/30-5/84
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