1/2w+2
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If it is a variable-name, then just fetch the value of the variable.
you have to deduce the variable and evaluate the expression.
evaluation, evaluate.
Replace each variables in the algebraic expression by its [known] value and calculate the value (ie evaluate) of the algebraic expression.
The evaluate a algebraic math expression you first must substitute a number for each variable. Then you must perform the operation in the correct order.