Perform the indicated operation below and simplify if possible by combining like terms.Write the result in standard form. 
Definitions:
Classical Conditioning
The acquisition of knowledge through the linkage between a stimulus found in the environment and one that happens naturally.
Resistance to Extinction
The resistance to disappearance of a conditioned response despite the lack of reinforcement.
Text Messages
Written messages sent or received over mobile phones or similar devices, utilizing short message service (SMS) technology.
Ex-girlfriend
Denotes a woman with whom one has had a romantic relationship in the past, but is no longer involved with in the present.
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