\"\"

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The expression is \"\".

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The value are \"\", \"\" and \"\".

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\"\"    (Substitute \"\", \"\" and \"\")

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             \"\"          (Evaluate: \"\")

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             \"\"                       (Multiply)

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

\

Therefore, the value of expression is \"\".

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\"\"

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The value of expression is \"\".