\left\{ \begin{array} { l } { x _ { 1 } + 3 x _ { 3 } + x _ { 4 } = 0 } \\ { x _ { 2 } + 3 x _ { 3 } + 2 x _ { 4 } = 0 } \\ { 2 x _ { 2 } + 3 x _ { 3 } = 0 } \\ { x _ { 1 } + 3 x _ { 3 } + x _ { 4 } = 0 } \end{array} \right.
Solve for x_1, x_3, x_4, x_2 (complex solution)
x_{1}=\frac{3x_{2}}{2}
x_{3}=-\frac{2x_{2}}{3}
x_{4}=\frac{x_{2}}{2}
x_{2}\in \mathrm{C}
Solve for x_1, x_3, x_4, x_2
x_{1}=\frac{3x_{2}}{2}
x_{3}=-\frac{2x_{2}}{3}
x_{4}=\frac{x_{2}}{2}
x_{2}\in \mathrm{R}
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