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When you have a substituted number put in less than 6 or 6 then N plus 10 will be larger than 2N plus three as N is worth little and therefore that means that 10 is able to be more important than 3 to a large enough degree. At 7 they equal each other at a point where they are about as large as each other as N was equal to the difference between 3 and 10. Finally from 8 and on 2N plus 3 is larger as the difference between Ns has become larger than the difference between 3 and 10