How to change the screen brightness on a macbook?

How to change the screen brightness on a macbook?
My Macbook is a May 2010 model in white
I am looking how to change the brightness using the keyboard, because I know how to change it using System Pres

The F1 and F2 keys control brightness.  Depending on how you have your function keys set up, you may have to also hold down the fn key to activate.

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