$$\underset{\,\,\,\,{\textcolor[rgb]{0.66,0.66,0.66}{\rightarrow {\mathtt{}}}}}{{solve}}{\left(\begin{array}{l}{\mathtt{4}}={\mathtt{8}}\\ {\mathtt{8}}={\mathtt{4}}\end{array}\right)} \Rightarrow \left\{ \begin{array}{l}\end{array} \right\}$$
