Solving a simple second order DE

How do I solve this

f''(x) +(1/2x) f'(x) + f(x) =0 ??

How do I start it?

It looks easy but it's not because of the coefficient .
Take a look here:
solve y''+(1/2 x)y'+y=0 - Wolfram|Alpha

If that is then:

WTF?

How do I do it on paper?