Solve for l (complex solution)
\left\{\begin{matrix}l=\frac{3a}{\left(m+1\right)\left(n+2\right)}\text{, }&n\neq -2\text{ and }m\neq -1\\l\in \mathrm{C}\text{, }&\left(m=-1\text{ or }n=-2\right)\text{ and }a=0\end{matrix}\right.
Solve for a
a=\frac{l\left(m+1\right)\left(n+2\right)}{3}
Solve for l
\left\{\begin{matrix}l=\frac{3a}{\left(m+1\right)\left(n+2\right)}\text{, }&n\neq -2\text{ and }m\neq -1\\l\in \mathrm{R}\text{, }&\left(m=-1\text{ or }n=-2\right)\text{ and }a=0\end{matrix}\right.
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