Solutions by everydaycalculation.com
135 - 635 is -17.
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Related: 2/35-6/35 1/35-12/35 1/70-6/35 1/35-6/70 3/35-6/35 1/35-18/35 5/35-6/35 1/35-30/35 7/35-6/35 1/35-42/35
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