Simplify the rational expression. 
Definitions:
Commercial Substance
A characteristic of a transaction indicating that it will result in a significant change in the economic circumstances of a business.
Future Cash Flows
The amount of money that is expected to be received or paid out by a business in the future.
Exchange of Assets
Transactions where businesses or individuals trade assets of similar value, such as property, equipment, or securities.
Units-Of-Production Method
A depreciation method allocating the cost of an asset over its useful life based on its level of activity or production.
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