$\"\"$

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The expression is $\"\"$ .

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Subtract the polynomials horizontally.

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$\"\"$ (Multiply the second polynomial with negative sign)

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$\"\"$ (Group like terms)

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

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

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The difference of polynomials is $\"\"$ .