Find the exact real solutions to the equation, if they exist. 
Definitions:
Lymph Nodes
Small, bean-shaped structures that are part of the lymphatic system, helping the body fight infections and other diseases.
Innate Physical Barrier
Natural barriers formed by the body’s anatomy, such as the skin and mucosal surfaces, that help prevent the entry of pathogens.
Washing Action
The process of cleansing or removing dirt, contaminants, or impurities from objects or surfaces, typically involving agitation and detergents or solvents.
Tears
A liquid produced by the lacrimal glands for lubrication, nourishment of the cornea, and protection against infection in the eye.
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