Find the set of real values of x for which

It seems there was some confusion with the numbering in our previous exchanges, as the image you sent contains questions 1 through 5. I have already solved the following questions from this image:

• Question 1 (i) a) and b)
• Question 2 (which is identical to Question 4 (i))
• Question 4 (ii)
• Question 5 (which was the complex number question I solved, but it's actually Question 4 (ii) in the image).

Let's continue by solving Question 1 (ii) from the image.

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Question 1 (ii): Find the set of real values of $x$ for which