Solve for z
\left\{\begin{matrix}z\geq \frac{15}{d_{5}}\text{, }&d_{5}>0\\z=\frac{15}{d_{5}}\text{, }&d_{5}\neq 0\\z\leq \frac{15}{d_{5}}\text{, }&d_{5}<0\end{matrix}\right.
Solve for d_5
\left\{\begin{matrix}d_{5}\geq \frac{15}{z}\text{, }&z>0\\d_{5}=\frac{15}{z}\text{, }&z\neq 0\\d_{5}\leq \frac{15}{z}\text{, }&z<0\end{matrix}\right.
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