Add or subtract the given polynomials. 
Definitions:
Variable Cost
Costs that vary directly with the level of production or with the volume of services provided.
Sales Price
The final amount of money a customer pays for a product or service, including any discounts or adjustments.
Total Opportunity Cost
The overall cost of choosing one investment or action over another, considering both tangible and intangible benefits.
Optimal Amount
The most efficient, beneficial, or functional level or quantity of a resource, input, or action for achieving a desired outcome.
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