\(\Leftrightarrow\left(4x^2-3x-18-4x^2-3x\right)\left(4x^2-3x-18+4x^2+3x\right)=0\)
\(\Leftrightarrow\left(-6x-18\right)\left(8x^2-18\right)=0\)
\(\Leftrightarrow\left(x+3\right)\left(2x-3\right)\left(2x+3\right)=0\)
hay \(x\in\left\{-3;\dfrac{3}{2};-\dfrac{3}{2}\right\}\)