Ebatzi: P
\left\{\begin{matrix}P=-\frac{x\sigma \left(n-1\right)}{2n+3}\text{, }&\sigma \neq 0\text{ and }x\neq 0\text{ and }n\neq -\frac{3}{2}\\P\neq -\frac{x\sigma }{2}\text{, }&\left(x=0\text{ or }\sigma =0\right)\text{ and }n=-\frac{3}{2}\end{matrix}\right.
Ebatzi: n
n=-\frac{3P-x\sigma }{x\sigma +2P}
P\neq -\frac{x\sigma }{2}
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