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参考・概略です

(2) 3x+1≦x+13<2x+9

 ① 3x+1≦x+13 を解いて、x≦6

 ② x+13<2x+9 を解いて、x>4

 ①,②の共通部分を求めて、4<x≦6

ありがとうございます😭

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