This topic should have been covered in your classroom and in your textbook before exercises were assigned on it. Since this is a simple one-step exercise, I will assume that you have not yet seen the necessary content.
Fortunately, there are loads of online lessons which can quickly remedy this deficiency, such as those listed here.
Please read at least two lessons from the listing, and then attempt the exercise. If you get stuck, please reply with a clear listing of your thoughts and efforts so far. Thank you!
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