Solve for b, c, a, K
b=-a-c\text{, }c\in \mathrm{R}\setminus -a,0\text{, }a\neq 0\text{, }K=-1
b=Kc-a\text{, }c=\frac{2a}{K}\text{, }a\neq 0\text{, }K\neq 0
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