Thanks for your advice. I have tried my best to understand the working steps but I can’t. Is there another working steps that is easier for me to understand please? Kindly advice

U seriously expect me to clarify further after downvoting my correct answer?

I am so sorry Mr Tan. Yes, your answer is correct but the steps are too complicated for me to understand. I am lost on the 2nd step.
I have been used to solve qn in models in primary school. I am new to algebra. I understand there is no obligation to derive simple steps for me. This app has only 2 options : satisfactory ans or not. I thought if I need further advice from u, I should not put satisfactory ans as that will close the case. So I put not satisfactory in hope for your attention and further advice.