If you want to write a balanced answer for an "agree or disagree" question, it's important to get the introduction right. Let's use last week's question as an example:
Nowadays celebrities are more famous for their glamour and wealth than for their achievements, and this sets a bad example to young people.
To what extent do you agree or disagree with this statement?
Here's my introduction. Notice that I use a "while" sentence to express my balanced opinion.
It is true that some celebrities are known for their glamorous lifestyles rather than for the work they do. While I agree that these celebrities set a bad example for children, I believe that other famous people act as positive role models.