Solve for k
\left\{\begin{matrix}\\k=0\text{, }&\text{unconditionally}\\k\in \mathrm{R}\text{, }&\epsilon =0\end{matrix}\right.
Solve for E
E\in \mathrm{R}
\epsilon =0\text{ or }k=0
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\left(-k\right)\epsilon =\frac{\mathrm{d}}{\mathrm{d}r}(E)
Swap sides so that all variable terms are on the left hand side.
-k\epsilon =\frac{\mathrm{d}}{\mathrm{d}r}(E)
Reorder the terms.
\left(-\epsilon \right)k=0
The equation is in standard form.
k=0
Divide 0 by -\epsilon .
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