Question 468208
ln(x+9)-ln(x-5)=ln(x+7)-ln(x-4).

Apparently there is no solution? Why not x=1/3?!
------------------
{{{ln((x+9)/(x+5)) = ln((x+7)/(x-4))}}}
{{{(x+9)/(x-5) = (x+7)/(x-4)}}}
{{{x+9)*(x-4) = (x-5)*(x+7)}}}
{{{x^2 + 5x - 36 = x^2 + 2x - 35}}}
3x = 1
x = 1/3
----------------
x = 1/3 makes ln(x-5) and ln(x-4) the logs of negative numbers.
 --> no solution.