Perform the indicated operations and simplify the expression. 
Definitions:
Calcium
A chemical element essential for living organisms, particularly in cell physiology and skeletal structures, such as bones and teeth.
Immune System
The complex network of cells, tissues, and organs that work together to defend the body against infection, disease, and foreign substances.
Stress
A reaction of the body and mind to demanding situations, which can be positive or negative and affects physical and mental health.
Susceptibility
The likelihood or predisposition to be affected by something, particularly a disease or condition.
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