$\"\"$ $\"\"$

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$\"\"$ (Commutative Property of Addition: $\"\"$ )

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$\"\"$ (Associative Property of Addition: $\"\"$ )

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$\"\"$

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$\"\"$ (Distributive property: $\"\"$ )

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$\"\"$ (Substitution property: $\"\"$ )

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$\"\"$

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The simplified expression is $\"\"$ .

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