\left\{ \begin{array} { l } { u _ { 0 } = 3 } \\ { u _ { 1 } = - \frac { 1 } { 2 } u _ { n } + 3 } \end{array} \right.
Solve for u_0, u_1, u_n
u_{0}=3
u_{1}=-\frac{u_{n}}{2}+3
u_{n}\in \mathrm{R}
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