\left\{ \begin{array}{l}{ y + z = - 1 }\\{ x - y = 1 }\\{ x + 2 y + 3 z = - 2 }\end{array} \right.
Solve for y, z, x (complex solution)
x\in \mathrm{C}
y=x-1
z=-x
Solve for y, z, x
x\in \mathrm{R}
y=x-1
z=-x
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