$\left\{\begin{matrix}x\geq \frac{66}{d-5}\text{, }&d<5\\x\leq \frac{66}{d-5}\text{, }&d>5\\x\in \mathrm{R}\text{, }&d=5\\x=\frac{66}{d-5}\text{, }&d\neq 5\end{matrix}\right.$

$\left\{\begin{matrix}d\geq 5+\frac{66}{x}\text{, }&x<0\\d\leq 5+\frac{66}{x}\text{, }&x>0\\d\in \mathrm{R}\text{, }&x=0\\d=5+\frac{66}{x}\text{, }&x\neq 0\end{matrix}\right.$