ud \geq - 7
Ebatzi: u
\left\{\begin{matrix}u\leq -\frac{7}{d}\text{, }&d<0\\u\geq -\frac{7}{d}\text{, }&d>0\\u\in \mathrm{R}\text{, }&d=0\\u=-\frac{7}{d}\text{, }&d\neq 0\end{matrix}\right.
Ebatzi: d
\left\{\begin{matrix}d\leq -\frac{7}{u}\text{, }&u<0\\d\geq -\frac{7}{u}\text{, }&u>0\\d\in \mathrm{R}\text{, }&u=0\\d=-\frac{7}{u}\text{, }&u\neq 0\end{matrix}\right.
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