I-evaluate (complex solution)
a_{n}n-a_{n}\neq -6n-117
I-solve ang n
\left\{\begin{matrix}n\in \mathrm{R}\text{, }&a_{n}=-6\\n\neq -\frac{117-a_{n}}{a_{n}+6}\text{, }&a_{n}\neq -6\end{matrix}\right.
I-solve ang a_n
\left\{\begin{matrix}a_{n}\in \mathrm{R}\text{, }&n=1\\a_{n}\neq -\frac{3\left(2n+39\right)}{n-1}\text{, }&n\neq 1\end{matrix}\right.
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