Ebatzi: r (complex solution)
\left\{\begin{matrix}r=\frac{3t}{x+y}\text{, }&x\neq -y\\r\in \mathrm{C}\text{, }&t=0\text{ and }x=-y\end{matrix}\right.
Ebatzi: r
\left\{\begin{matrix}r=\frac{3t}{x+y}\text{, }&x\neq -y\\r\in \mathrm{R}\text{, }&t=0\text{ and }x=-y\end{matrix}\right.
Ebatzi: t
t=\frac{r\left(x+y\right)}{3}
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