I don't fully understand why you need to solve it this way... $$x^25\log(2x+1)+9(-5)\log(2x+1)=0 $$
$$(x^2-9)5\log(2x+1)=0$$
I don't fully understand why you need to solve it this way... $$x^25\log(2x+1)+9(-5)\log(2x+1)=0 $$
$$(x^2-9)5\log(2x+1)=0$$