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0<9-4K
9-4K<0 ←ここで不等号の向きがちがいます。
9-4K>0 で解けると思います!

羽那

ありがとうございます

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Answers

0<9-4k
から9-4k<0と逆になってます

羽那

ありがとうございます!

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