Question 909228
{{{e^(-x) = 5^(2x)}}}

{{{ln(e^(-x)) = ln(5^(2x))}}}

{{{ -x = 2x*ln(5)}}}

{{{0 = 2x*ln(5) + x}}}

{{{0 = x(2*ln(5) + 1)}}

{{{x = 0}}}