\"\"

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The expression is  \"\".

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\"\"                           (Substitute \"\")

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\"\"                           (Product of two opposite signs is negative)

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

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

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

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

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\"\"                                                      (Divide: \"\")      \"\"     

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The value of expression is \"\".