Solve the differential equation using the method of variation of parameters. 
Definitions:
Formal Process
A structured method of operations that follows a defined sequence of steps, often documented and standardized.
Step-review Systems
A structured process for evaluating an employee's performance using a series of progressive steps or stages.
Grievance Procedures
Formal processes used within organizations to address complaints or disputes from employees regarding workplace issues.
Union Contracts
Agreements between employers and labor unions that outline wages, hours, benefits, and other employment terms and conditions.
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