x + 2 x - 2 - x - 2 x + 2 x - 2 x + 2 + x + 2 x - 2
Chapter 6, Problem 19(choose chapter or problem)
x + 2 x - 2 - x - 2 x + 2 x - 2 x + 2 + x + 2 x - 2
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