Question 1074457
<pre><font size=4><b>
 {{{3log(x,(1/81))-12=0}}}

 {{{3log(x,(1/81))=12}}}

 {{{log(x,(1/81))=4}}}

{{{x^4=(1/81)}}}

{{{x^4=1/3^4}}}

{{{x^4=(1/3)^4}}}

Take 4th roots of both sides:

{{{x="" +- 1/3}}}

That base of a logarithm can only be positive and not 1.

{{{x=1/3}}}

Edwin</pre></b></fonr>