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[tex]2 |x + 7| - |x + 7| - |x + 7| [/tex]
Urgent,va rog.


Răspuns :

[tex]2|x+7| - |x+7| - |x+7|=\\ \\ = |x+7| \cdot (2-1-1) = \\ \\ = |x+7| \cdot 0 =\\ \\= 0[/tex]