Question 642253
{{{(e^4)^(3x)=e^4e^(3x)}}}

{{{e^(12x)=e^(3x+4)}}}....if bases equal, exponents are equal too; so, you have

{{{12x=3x+4}}}

{{{12x-3x=4}}}

{{{9x=4}}}

{{{x=4/9}}}