Horizontal Spring Pulled from Equilibrium?

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riseofphoenix
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ScreenShot2012-12-12at95828AM.png


I don't necessarily understand the explanation given to the solution.
Is it basically saying:

A (valley) --> 0 (equilibrium) --> -A (valley) --> 0 (equilibrium) --> A (valley)?
 
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riseofphoenix said:
ScreenShot2012-12-12at95828AM.png


I don't necessarily understand the explanation given to the solution.
Is it basically saying:

A (valley) --> 0 (equilibrium) --> -A (valley) --> 0 (equilibrium) --> A (valley)?
What valley are you referring to?

The block moves horizontally.