solve x^3- 3x-9 = 0
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x^3-3x-8=0
=⟩x×x×x-3x-9=0
=⟩x×x×x-3x=0+9=9
=⟩x×x×x×x=9+3
=⟩4x=12
=⟩x=12/4
=⟩x=3
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