How to show the other side of the argument in an opinion essay.
In an opinion essay you should give 2 reasons for your opinion in the thesis statement then back them up with with an explanation in the main body paragraphs. I usually advise my students to choose one side, either agree or disagree, and stick with that.
You do not actually get a higher band score for a balanced approach, so it is safer to choose one side and stick with that view throughout the essay. Remember that your opinion must be in the introduction, main body paragraphs and the conclusion.
However, something that will showcase your language ability is to show the other side of the argument or give a concession to help balance the essay. This gives the essay good coherence cohesion and a wider range of grammar. This should be done carefully though, because you still have to maintain your own opinion and not contradict yourself.