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 14 ≦ 5a+6 < 21
全辺から6を引きます
  8 ≦ 5a < 15
全辺を5で割ります
 8/5 ≦ a < 3

Hi-ri

ありがとうございます!

かき

いえいえ。また何かあればどうぞ〜😊

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