I need help , I don’t need the answer and I just want you to explain to me how did she got the 9x from? Please help I don’t get it

SOLUTION:
Step 1:
In this question, we are given the following:
Step 2:
The details of the solution are as follows:
CONCLUSION:
From the above explanations, we can see clearly that the correct solution to the logarithmic equation is:
[tex]x\text{ =}\frac{11}{4}[/tex]