Løs for n
\left\{\begin{matrix}n>-\frac{-8kx+2x+15k^{2}-2k-7}{hx^{2}}\text{, }&h>0\text{ and }x\neq 0\\n\in \mathrm{R}\text{, }&\left(k>\frac{1}{4}\text{ and }x<-\frac{15k^{2}-2k-7}{2-8k}\right)\text{ or }\left(x>-\frac{15k^{2}-2k-7}{2-8k}\text{ and }k<\frac{1}{4}\right)\\n<-\frac{-8kx+2x+15k^{2}-2k-7}{hx^{2}}\text{, }&h<0\text{ and }x\neq 0\end{matrix}\right,
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