# Math Help - Logarithms - a long one...

1. ## Logarithms - a long one...

I got confused , how can i solve this? :
$1-\frac{4\log_{100}(20-x)}{\log(x)}=\frac{1}{\log_\frac{1}{10}(x)}$

Thanks...

2. Remember:
$\log_a(x) = \frac{\log_{10}(x)}{\log_{10}(a)}$
and
$1=\log_{10}(10)$

3. Yes I remembered it and just solved it, thank you.
$x=10$