Use the method of substitution to solve the system. 
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Preface
An introductory section of a book or document, usually outlining its purpose, scope, and acknowledgments.
Comprehension Skills
The ability to understand and interpret information or texts read.
Active Reader
A reader who engages with the text through questioning, predicting, summarizing, and clarifying.
Own Reading System
A personalized approach or method developed by an individual to enhance their reading skills and comprehension.
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