If the system of equations
$(\lambda -1)\text{x}+(\lambda -4)\text{y}+\lambda \text{z}=5$
$\lambda \text{x}+(\lambda -1)\text{y}+(\lambda -4)\text{z}=7$
$(\lambda +1)\text{x}+(\lambda +2)\text{y}-(\lambda +2)\text{z}=9$
has infinitely many solutions, then ${{\lambda }^{2}}+\lambda $ is equal to