\(64\cdot4^x=16^8\)
\(\Rightarrow4^3\cdot4^x=\left(4^2\right)^8\)
\(\Rightarrow4^{x+3}=4^{16}\)
\(\Rightarrow x+3=16\)
\(\Rightarrow x=16-3\)
\(\Rightarrow x=13\)
Vậy : x=13
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