Perform the indicated operation below and simplify if possible by combining like terms.Write the result in standard form. 
Definitions:
Depressive Episode
A period characterized by symptoms of major depression, such as deep sadness, loss of interest, sleep disturbances, and feelings of worthlessness, lasting for at least two weeks.
Lethargy
A state of sluggishness, drowsiness, or lack of energy, which can be a symptom of various conditions.
Neurotransmitters
Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.
Serotonin
A neurotransmitter that contributes to feelings of well-being and happiness, also involved in regulating mood, appetite, and sleep among other physiological processes.
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