\"\"

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The expression is \"\".

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Exclude the values for which 3 + a = 0, and the denominator cannot equal 0.

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Apply subtraction property of equality: If a = b then \"\".

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\"\"

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\"\"                                       (Apply additive inverse property: \"\")

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\"\"                                         (Apply additive identity property: \"\")

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Then the value of a not equal \"\".\"\"

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The value of a not equal \"\".