Solve for a (complex solution)
\left\{\begin{matrix}a=b+\frac{6k}{p}\text{, }&p\neq 0\\a\in \mathrm{C}\text{, }&k=0\text{ and }p=0\end{matrix}\right.
Solve for b (complex solution)
\left\{\begin{matrix}b=a-\frac{6k}{p}\text{, }&p\neq 0\\b\in \mathrm{C}\text{, }&k=0\text{ and }p=0\end{matrix}\right.
Solve for a
\left\{\begin{matrix}a=b+\frac{6k}{p}\text{, }&p\neq 0\\a\in \mathrm{R}\text{, }&k=0\text{ and }p=0\end{matrix}\right.
Solve for b
\left\{\begin{matrix}b=a-\frac{6k}{p}\text{, }&p\neq 0\\b\in \mathrm{R}\text{, }&k=0\text{ and }p=0\end{matrix}\right.
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