Cash back in BRRRR? How exactly?

[Chisom Frazier]

So I'm a newbie. Like REAL new. Just in my education gathering phase. Currently reading Brandon's book on Rental Property Investing. The BRRRR strategy intrigued me, but.....how exactly do you get your CASH back during the refinance? Ever write a very common word down on paper and for whatever reason that day it just doesn't look spelled correctly? I'm thinking maybe it's so obvious that's it's confusing me, but I've only purchased two personal residences in my life and never refinanced. If the after rehab value is $150K and you refi after the rehab phase for $105K is the bank writing you a $45,000 check??? The way it's written is making it sound like money is literally coming back to you, not just in the form of equity because it is then used to "repeat" the process. I'm not clear and don't want to ASSume. Please clarify/confirm what may be right under my nose but doesn't seem right for some reason.