(a) Given, $\log_{5}{\log_{5}{\log_{2}{x = 0}}}$ $\Rightarrow \log_{5}{\log_{2}{x = 5^{0} = 1}}$ $\Rightarrow \log_{2}{x = 5 \Rightarrow x = 2^{5} \Rightarrow x = 32}$
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