Solve the system of linear equations. 
Definitions:
Payback Period
The time it takes for an investment or project to generate cash flow or profits sufficient to cover the initial outlay or cost.
Scrap Value
The estimated value that an asset will realize upon its sale at the end of its useful life.
Net Operating Income
The income generated from a company's everyday business operations, excluding taxes and interest.
Discount Rate
The specified interest rate for determining the present value of future cash flows in the context of discounted cash flow studies.
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