\(\Leftrightarrow1-3x+3x^2-x^3+x^3-6x^2+12x-8+3\left(x^2-2x+1\right)=0\)
\(\Leftrightarrow-3x^2+9x-8+3x^2-6x+3=0\)
=>3x-5=0
hay x=5/3
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