Solve for T_0
\left\{\begin{matrix}\\T_{0}=0\text{, }&\text{unconditionally}\\T_{0}\in \mathrm{R}\text{, }&y=0\text{ or }r=0\text{ or }x_{1}=0\end{matrix}\right.
Solve for r
\left\{\begin{matrix}\\r=0\text{, }&\text{unconditionally}\\r\in \mathrm{R}\text{, }&y=0\text{ or }x_{1}=0\text{ or }T_{0}=0\end{matrix}\right.
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T_{0}r^{2}x_{1}y=0
Multiply r and r to get r^{2}.
x_{1}yr^{2}T_{0}=0
The equation is in standard form.
T_{0}=0
Divide 0 by r^{2}x_{1}y.
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