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A-17.

Simplify each algebraic expression below, if possible. If it is not possible to simplify the expression, explain why not.  

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    Combine like terms.

    Arrange from the highest to the lowest power.

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    Is there any way to combine terms?
    Remember, you can only add terms if they have the exact same variable.

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    Follow steps taken in part (a).

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    Follow the steps taken in part (a).