\left\{ \begin{array} { l } { x = \lambda } \\ { y = 1 } \\ { z = - \lambda } \end{array} \right.
Solve for x, y, z
x=\lambda
y=1
z=-\lambda
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z=-\lambda
Solve z=-\lambda for z.
x=\lambda y=1 z=-\lambda
The system is now solved.
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