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

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The expression is $\"\"$ .

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Distribute terms using distributive property: a(b + c) = ab + ac.

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$\"\"$ (Distribute 3)

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Distribute terms using distributive property: a(b $\"\"$ c) = ab $\"\"$ ac.

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$\"\"$ (Distribute 6)

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

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

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Apply commutative property of addition: $\"\"$ .

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$\"\"$

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Combine like terms using distributive property: $\"\"$ .

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$\"\"$

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

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$\"\"$ (Add: 12 + 6 = 18) $\"\"$

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The simplified expression is $\"\"$ .