$\"\"$

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The expression is $\"\"$ .

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Apply distributive property: $\"\"$ .

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$\"\"$ (Distribute 3y)

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$\"\"$ (Commutative property of multiplication)

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$\"\"$ (Associative property of multiplication)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$

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The simplified expression is $\"\"$

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