Ответы на вопрос:
Log(4x+5) = 2 + log(x-4) => log(4x + 5) - log(x - 4) = 2 => log((4x + 5) / (x - 4)) = 2 => (4x + 5) / (x - 4) = 25 => 4x + 5 = 25x - 100 => 21x = 105 => x = 5
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