Add or subtract the rational expressions. Reduce the final answer. 
Definitions:
Loose Connective Tissue
A type of connective tissue characterized by a loosely organized matrix, which supports, binds together, and provides nutrients to surrounding tissues.
Elastic Tissue
A type of connective tissue that allows tissues in the body to resume their shape after stretching or contracting.
Vertebrae
The individual bones that stack to form the vertebral column or spine.
Dense Irregular Connective Tissue
A type of connective tissue with fibers that are thick, densely packed, and arranged in an irregular pattern, providing strength and resistance to forces from multiple directions.
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