Solve the differential equation using the method of variation of parameters. 
Definitions:
Total Cost
The complete cost of production for a business, including both fixed and variable costs.
Average Total Cost
The total cost of production divided by the number of units produced, representing the cost per unit of goods or services.
Average Total Cost
The sum of all production expenses (both constant and changeable) divided by the total amount of products made.
Marginal Cost
The cost of producing one additional unit of a good, important for decision-making in production processes.
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