\(\Leftrightarrow\left(x^2-x+1\right)^2-6x^2\left(x^2-x+1\right)^2+5x^4=0\)
\(\Leftrightarrow\left(x^2-x+1-5x^2\right)\left(x^2-x+1-x^2\right)=0\)
\(\Leftrightarrow\left(-4x^2-x+1\right)\left(-x+1\right)=0\)
hay \(x\in\left\{1;\dfrac{-1+\sqrt{17}}{8};\dfrac{-1-\sqrt{17}}{8}\right\}\)