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The author points out the bad notions but sticks by the "9" answer. However, if you were to write: 6 ÷ 2x ... no one would think you would do 6 divided by 2 then multiple by 2. I hate these "gotcha" #math questions. /1

Most people and the way Math is written would consider 2(1+2) as a single term. If you wanted to express, it differently, but nearly as bad: 6 ÷ 2 x (1+2) or 6 ÷ 2 ⋅ (1+2). More explicitly -- but overly verbose.: 6 ÷ (2(1+2)). /2