Does anybody know what's wrong with this theorem ?

Theorem: 4 = 5
                  Proof:
                  16 - 36 = 25 - 45
                  4^2 - 9*4 = 5^2 - 9*5
                  4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
                  (4 - 9/2)^2 = (5 - 9/2)^2
                  4 - 9/2 = 5 - 9/2
                  4 = 5


merry christmas every body and happy new year !!

Nasrul Indroyono

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