Solve the equation. 
Definitions:
Basic Arousal States
The fundamental levels of physiological alertness and responsiveness in an individual.
Pleasant And Unpleasant
Terms describing experiences, sensations, or emotions that are either enjoyable and satisfying or uncomfortable and displeasing.
Happiness And Parenthood
The relationship and impact of having children on the happiness and well-being of parents.
Couples
Two individuals who are romantically or sexually involved and often share a close bond or partnership.
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