I've finally learned how to do these, I've got a list of them, but this one: NH4OH + H2SO4 = (NH4)2SO4 + H2O is really throwing me.. how..?

I balance this equation?
I know the answer is
2NH4OH + H2SO4 ---> (NH4)2SO4 + 2H2O

but why is this one so much trickier than the rest, for example I can do ones like
KHCO3 + H2SO4 = K2SO4 + CO2 + H2O
but not the one above this one?
is there a reason or am I just getting tired?
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