Solutions by everydaycalculation.com
145 - 645 is -19.
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Related: 2/45-6/45 1/45-12/45 1/90-6/45 1/45-6/90 3/45-6/45 1/45-18/45 5/45-6/45 1/45-30/45 7/45-6/45 1/45-42/45
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