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Replace each variable in the expression by its value and then find the value of the expression.
Take the value of each variable in the expression and replace the variable by its value. Then do the math!
The answer will depend on the expression - which is not given!
Replace each variables in the algebraic expression by its [known] value and calculate the value (ie evaluate) of the algebraic expression.
The value that results from the substitution of a given input into an expression or function is the output. The value substituted into an expression or function is an input.