Solve for a
\left\{\begin{matrix}a=\frac{2x_{1}+x_{2}}{pxz}\text{, }&z\neq 0\text{ and }x\neq 0\text{ and }p\neq 0\\a\in \mathrm{R}\text{, }&x_{1}=-\frac{x_{2}}{2}\text{ and }\left(z=0\text{ or }x=0\text{ or }p=0\right)\end{matrix}\right.
Solve for p
\left\{\begin{matrix}p=\frac{2x_{1}+x_{2}}{axz}\text{, }&z\neq 0\text{ and }x\neq 0\text{ and }a\neq 0\\p\in \mathrm{R}\text{, }&x_{1}=-\frac{x_{2}}{2}\text{ and }\left(z=0\text{ or }x=0\text{ or }a=0\right)\end{matrix}\right.
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pxza=2x_{1}+x_{2}
The equation is in standard form.
\frac{pxza}{pxz}=\frac{2x_{1}+x_{2}}{pxz}
Divide both sides by pxz.
a=\frac{2x_{1}+x_{2}}{pxz}
Dividing by pxz undoes the multiplication by pxz.
axzp=2x_{1}+x_{2}
The equation is in standard form.
\frac{axzp}{axz}=\frac{2x_{1}+x_{2}}{axz}
Divide both sides by axz.
p=\frac{2x_{1}+x_{2}}{axz}
Dividing by axz undoes the multiplication by axz.
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