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When you have an algebraic expression with variables in it, you need to know the the value of each variable. The value of the expression is found by replacing the variables with their values and simplifying.

For example, evaluate 2xy-3x if x=5 and y=-1.

2xy-3x = 2*5*(-1) -3*5 = -10-15 = -25.

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Q: What is value of an expression?
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