It is done by substituting the values of the variables in the expression and then hope that you are capable of evaluating the result.
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you have to deduce the variable and evaluate the expression.
Replace each variables in the algebraic expression by its [known] value and calculate the value (ie evaluate) of the algebraic expression.
Evaluate using PEMDAS
Simplify !
Given a value of x, find the value for -3x + 2