The system of equationsbr /\[br /\begin{aligned}br /&x+y+z=5 \\...

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The system of equationsbr /\[br /\begin{aligned}br /&x+y+z=5 \\br /&x+2 y+3 z=9 \\br /&x+3 y+\lambda z=\mubr /\end{aligned}br /\]has a unique solution, if
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