\"\"\"\"\"\"

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The expression is \"\".

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

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\"\"            (Multiply: \"\")

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

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\"\"                  (Commutative property: \"\")

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\"\"               (Distributive property: \"\").

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

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

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The simplified expression is \"\".