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.
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[10-(4*2)]*3
Evaluating the expression is usually used in math, and it means solve the question.
A term often used is "evaluate".
Find the value of the expression.
everywhere you see the variable, put it's value there instead, then do all of the math (+-x/)