Question 398153
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Hi
If I am understanding Your question properly:
*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 3log_4(x) \ = \ 9 \ \ \Rightarrow\ \ 4^9 = x^3]
  4^9 = (4^3)^3 = x^3
        4^3 = x
         64 = x