Solve the differential equation using the method of variation of parameters. 
Definitions:
Influencer
An individual who has the power to affect the purchasing decisions of others because of their authority, knowledge, position, or relationship with their audience.
Decision Maker
An individual or group responsible for making choices that will affect the outcome of a particular process or situation.
Purchaser
An individual or organization that buys goods or services for personal use or for further processing or manufacturing.
Culture
The set of values, ideas, and attitudes that are learned and shared among the members of a group.
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