\"\"

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Given expression is \"\".

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\"\"                 (Substitute x = 2, y = 5 and z = 7)

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

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

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

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\"\"               (Multiply:\"\")

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

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\"\"                                 (Add: \"\")\"\"

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The solution is \"\".