Can someone help me to know how to solve this thing without a calculator/by guessing? I'm trying to find the value of X.
In fact, I know the answer is X = 9, but how I'm a supposed to know that?.
Usually you can know the value of X when you get a final result of the equation but here the result is basically another equation that assumes I know X already when that's what I'm trying to solve lol.

I wish someone could break down whe whole process which Idk