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It means you replace each instance of the given variable with the given value.

For instance, you have the following equation:

A(A+2A)= B

Then someone says to "substitute the value '4' for each instance of 'A'.

You'd just replace them, and get:

4 ( 4 + 2(4)) = B

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Q: What does it mean to substitute a given value for each variable in an algeraic expression?
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