I got confused , how can i solve this? : $\displaystyle 1-\frac{4\log_{100}(20-x)}{\log(x)}=\frac{1}{\log_\frac{1}{10}(x)}$ Thanks...
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Remember: $\displaystyle \log_a(x) = \frac{\log_{10}(x)}{\log_{10}(a)} $ and $\displaystyle 1=\log_{10}(10)$
Yes I remembered it and just solved it, thank you. $\displaystyle x=10$
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