\(\Leftrightarrow4x\left(x-2\right)+\left(x+1\right)\left(x-2\right)=3-5x^2\)
\(\Leftrightarrow4x^2-8x+x^2-x-2=3-5x^2\)
\(\Leftrightarrow10x^2-9x-5=0\)
hay \(x\in\left\{\dfrac{9+\sqrt{261}}{20};\dfrac{9-\sqrt{261}}{20}\right\}\)
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