Sal Khan, CK-12 Foundation
You are absolutely tired of not knowing how to deal with equations that have absolute values in them. Well, this tutorial might help. Source: Khan Academy (www.khanacademy.org), used under the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) license. All Khan Academy content is available for free at www.khanacademy.org. Khan Academy does not endorse the World Public Library.
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