Resuelve los siguientes sistemas de ecuaciones:[br][br] [img]https://latex.codecogs.com/svg.image?\left\{\begin{matrix}x+2y+3z=4\\-x+y+z=0\\4x+2y+3z=7\\\end{matrix}\right.[/img] [img]https://latex.codecogs.com/svg.image?\left\{\begin{matrix}3x+y+z=2\\2x+y+z=2\\5x-y+2z=3\end{matrix}\right.[/img] [img]https://latex.codecogs.com/svg.image?\left\{\begin{matrix}x+4y+z=-2\\2x+5y-z=-10\\3x+6y+3z=-18\end{matrix}\right.[/img]