Another math problem help

Okay so consider this expression:
p-2p+3p-4p
-----------
p

Evaluate the expression when p=4
Evaluate the expression when p=17
Evaluate when p=132

I found out that everytime the results are -2, becaue the p's cancel out. Is this correct?

combine like terms (well, all) in the numerator = -2p

-2p/p = -2, so all values (except undefined if p=0) are -2

correct

yea