Justification for |a - b| = |b - a| | 7th grade | Kh...Khan Academy
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Watch the next lesson: https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-negative-numbers-add-and-subtract/cc-7th-properties-of-addition-and-subtraction/v/equivalent-expressions-with-negative-numbers?utm_source=YT&utm_medium=Desc&utm_campaign=7thgrade
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