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Error analysis: describe and correct the error in solving the equation. 1) the only solution of the equation x^2+6x+9=0 is x=9

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Error analysis: describe and correct the error in solving the equation. 1) the only solution of the equation x^2+6x+9=0 is x=9​

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Error analysis: describe and correct the error in solving the equation. 1) the only solution of the equation x^2+6x+9=0 is x=9