Solve for r
\left\{\begin{matrix}\\r=0\text{, }&\text{unconditionally}\\r\in \mathrm{R}\text{, }&x=0\end{matrix}\right.
Solve for x
\left\{\begin{matrix}\\x=0\text{, }&\text{unconditionally}\\x\in \mathrm{R}\text{, }&r=0\end{matrix}\right.
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80xr=0
The equation is in standard form.
r=0
Divide 0 by 80x.
80rx=0
The equation is in standard form.
x=0
Divide 0 by 80r.
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