Question 1008163
What you wrote and what you mean could be two different things.

{{{13^(-x)=3}}}, what does {{{13^(2x)}}} mean?


{{{13^(-x)=3}}}
{{{1/(13^x)=3}}}
{{{13^x=1/3}}}



Next:
{{{13^(2x)=13^(x+x)}}}
{{{(13^x)(13^x)}}}
Substituting from transformed definition,
{{{(1/3)(1/3)}}}
{{{highlight(1/9)}}}