Perform the indicated operations and simplify the expression. 
Definitions:
Water Pollutants
Substances that contaminate bodies of water, negatively affecting water quality and ecosystem health.
Noxious Odors
Unpleasant and potentially harmful smells that can cause discomfort or health issues.
Common Law
A legal system based on custom and court rulings rather than written laws passed by a legislature.
National Pollutant Discharge
The release of pollutants from point sources into navigable waters, regulated by national environmental authorities.
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