Now our next step is to basically equate this guy, to simply this guy and rewrite the equations to a better looking formula so this guy, using the logs of logs, we can rewrite in this format. So natural log of P final divided by P initial equals. Now, notice on this side, we have two common terms or one common term. This guy and this guy are two of the same term. It's the same term. So basically, you want to take this guy out of our equation and leave this guy and this guy alone.