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 Description  
 Evaluate an Algebraic Expression:  To find the value of an expression by replacing each variable in an expression with numbers.
For example, evaluating the algebraic expression x2 + 3xy for x = 1 and y = 2 means substituting given values for x and y in the expression and calculate it. In other words, 12 + 3*1*2 = 1 + 6 = 7.