Solve for K, R, r, a, b
r=b\text{, }K=\frac{4e}{r+R^{2}}\text{, }R\in \mathrm{R}\setminus -\sqrt{-r}\text{, }r\leq 0,\sqrt{-r}\text{, }r\leq 0,\sqrt{-b},-\sqrt{-b}\text{, }a=b\text{, }b\leq 0
r=b\text{, }K=\frac{4e}{r+R^{2}}\text{, }R\in \mathrm{R}\setminus -\sqrt{-r}\text{, }r\leq 0,\sqrt{-r}\text{, }r\leq 0\text{, }a=b\text{, }b>0
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