Solutions by everydaycalculation.com
345 - 645 is -115.
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Related: 6/45-6/45 3/45-12/45 3/90-6/45 3/45-6/90 9/45-6/45 3/45-18/45 15/45-6/45 3/45-30/45 21/45-6/45 3/45-42/45
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