$$\underset{\,\,\,\,{\textcolor[rgb]{0.66,0.66,0.66}{\rightarrow {\mathtt{q}}}}}{{solve}}{\left(\begin{array}{l}{\mathtt{11}}{\mathtt{\,\times\,}}{\mathtt{q}}=-{\mathtt{11}}\\
{\mathtt{q}}=-{\mathtt{1}}\end{array}\right)} \Rightarrow {\mathtt{q}} = -{\mathtt{1}}$$
.
