3) \(\Leftrightarrow-4x^2-x+3=-x-22\)
\(\Leftrightarrow-4x^2=-25\Leftrightarrow x^2=\dfrac{25}{4}\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{5}{2}\\x=-\dfrac{5}{2}\end{matrix}\right.\)
4) \(\Leftrightarrow2x^3-x^2+6x-3-6x+x^2=-19\)
\(\Leftrightarrow2x^3==-16\Leftrightarrow x^3=-8\Leftrightarrow x=-2\)
5) \(\Leftrightarrow-2x^2-9x+5=4x+5\)
\(\Leftrightarrow-2x^2-13x=0\)
\(\Leftrightarrow-2x\left(x+\dfrac{13}{2}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-\dfrac{13}{2}\end{matrix}\right.\)
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