\"\"

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The expression is \"\".

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\"\"               (Substitute: a = 26 and b = 10)

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

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\"\"                      (Evaluate power \"\")

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

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\"\"                                    (Write \"\") 

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\"\"                                       (Cancel square and root) \"\"

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 The solution is 8.