$\"\"$

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The polynomial is $\"\"$ .

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Horizontal method:

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$\"\"$ (Group like terms)

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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The value of $\"\"$ $\"\"$ . $\"\"$

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Vertical method:

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Align like terms in columns and combine.

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$\"\"$

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Thus, The value of $\"\"$ $\"\"$ . $\"\"$

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The value of $\"\"$ $\"\"$ .