Simplify the expression algebraically. 
Definitions:
Criterion Measure
A standard or benchmark against which the validity of a test score or the performance of an individual can be evaluated.
Grade Point Average
A numerical calculation representing the average value of the accumulated final grades earned in courses over time.
Item Analysis
A series of statistical tests and procedures that can be used to assess for homogeneity in a test.
Construct Validity
The degree to which a test accurately measures the theoretical construct or concept it is intended to measure.
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