log3x+log3x2+log3x3=18⇒log3x+2log3x+3log3x=18⇒6 log3x = 18⇒ log3x = 3⇒x = 33⇒x = 27

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\log_{3} (x) + \log_{3} (x^{2}) + \log_{3} (x^{3}) = 18 \Rightarrow \log_{3} (x) + 2 \log_{3} (x) + 3 \log_{3} (x) = 18 \Rightarrow 6 \log_{3} (x) = 18 \Rightarrow \log_{3} (x) = 3 \Rightarrow x = 3^{3} \Rightarrow x = 27

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