Re-arranging formula question

Hi All,

I'm having a slight problem with a re-arranging formula question (not a marked one, the answers are on the sheet, I just don't know how to get to the specified answer) it should be easy and I'm pretty embarrassed that I can't do it.

The question is make 'x' the subject of:

According to the sheet the correct answer is

I've tried it various ways though and usually end up with

If anyone could break down how you get the correct answer that would be great. Thanks in advance.