\"\"

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Phrase: Eight more than the sum of six times a number and nine times a number added to one.

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Variable: Let \"\" represents the number.

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Expressions: \"\".

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Therefore, the algebraic expression is \"\".

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Simplify the expression.

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\"\"            (Original expression)

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\"\"                 (Add: \"\")

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\"\"                 (Commutative property of addition: \"\".)

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\"\"              (Associative property of addition: \"\")

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

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\"\".

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\"\"

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The algebraic expression is \"\".

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The simplified expression is \"\".