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2-51.

Simplify the following expressions by combining like terms, if possible.  

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    Rearrange and put like terms together.

     4 arrows, one each from the  terms: x, x, 2 x, and negative x, to the combined result of 3 x.

    Organize the terms from the greatest to the smallest power.

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    Follow the steps in part (a).

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    Are there any like terms to combine?

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