Why is following expression TRUE?

I recently started learning C from Sams Teach Yourself C In 21 DAYS, and I can't understand why one expression evaluates to TRUE. It's one of the excersises at the end of the chapter.

x = 4
y = 6
z = 2
if(x != y - z)

I thought that "-" has higher precedence than "!=". What am I missing? I mean, it's getting late and I've been awake since 5am, so maybe my brain is giving up...