[tex] \frac{2x-1}{\frac{-x}{3}}=\frac{x+3}{6} [/tex]
[tex] \left(2x-1\right)\cdot \:6=\frac{-x}{3}\left(x+3\right [/tex]
[tex] \frac{2x-1}{\frac{-x}{3}}=\frac{x+3}{6} \\ \\ (2x-1)\cdot6\cdot3=-\frac{x}{3}\cdot(x+3)\cdot3\\ \\ 18\cdot(2x-1)=-x(x+3)\\ \\ 36x-18=x^{2} -3x\\ \\ -x^{2} -3x=36x-18\\ \\ -x^{2} -39x+18=0\\ \\ [/tex]
x₁=(-39+3√177)/2
x₂=(-39-3√177)/2
