Solve the system using Gaussian elimination. 
Definitions:
Customer Lifetime Value
A prediction of the net profit attributed to the entire future relationship with a customer.
Relationship
The connection or association between individuals, groups, or entities, which can be professional, personal, or commercial in nature.
Relationship Selling
A sales approach focusing on building long-term relationships with customers, rather than on individual transactions, to foster loyalty and repeat business.
Multi-level Marketing
A strategy some direct sales companies use to encourage existing distributors to recruit new distributors by paying the existing distributors a percentage of their recruits' sales.
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