Can you please explain to me why the the attached screenshot is not just    X=-2

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.5: Multiplication With The Addition-or-subtraction Method
Problem 36WE
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Can you please explain to me why the the attached screenshot is not just 

 

X=-2<x<4

Where does the negative infinity and positive infinity answers stem from? Could you also please graph this on a line ?

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