Hello, and welcome to FMH!
The first equation is being subtracted from the second, to obtain the third.
How do you get the 1 out of the (1+r) ?
And, thanks glad to have found FMH.
EDIT: is it beacuse if you minus the PV you can essentially eliminate the infinite sequence, because PV equals the infinite sequence?
That makes a lot more sense now in retrospect thanks! Would you mind reviewing my additional questions in the previous post? If not I understand. I am very thankful for your help!Yes, that's what I meant by subtracting the first equation from the second.