Here's the equation
ln(P1/P2)=((deltaHvap)/(R))*((T1-T2)/(T1*T2))
im trying to isolate T1
I got stuck at

T2((R/(deltaHvap)))(ln(P1/P2)) = (T1-T2)/T1


ok so i eventually figured out how to break the right side
turns out (T2-T1)/T1 equals the same as
1-(T2/T1) because you are able to break it into this (T1/T1) - (T2/T1) =(T1-T2)/T1

let (R/deltaHvap) = x
let (ln(p1/p2)) = y
my final equation came out to be
(-T2)/((T2*X*Y)-1) = T1

Well, I'm sorry to say, but such mathematical equations are very hard to read. I've made a Word-document which makes it more clearly. Hope this helps!