Solve the system of linear equations by elimination. 
Definitions:
Young Age
A stage of life characterized by early development and growth, typically referring to childhood or youth.
Mental Disorder
A condition characterized by disturbances in a person's thoughts, emotions, or behavior, leading to significant distress or impaired functioning.
Given Year
A specific year that is mentioned or referred to in a context.
Percent
A ratio or fraction expressed as a part of 100 denoting a proportion of a whole.
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