$\"\"$ \ \

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The expression is $\"\"$ .

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$\"\"$ (Distributive property: a(b + c) = ab + bc)

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

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

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$\"\"$

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$\"\"$ (Distributive property: a(b + c) = ab + bc)

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$\"\"$ (Add: 9 + 21 = 30)

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$\"\"$

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The simplified expression is $\"\"$ .