Three vectors $\overline{a}$, $\overline{b}$ and $\overline{c}$ satisfy $\overline{a}\mathit{+}\overline{b}\mathit{+}\overline{c}\mathit{=}\overline{0}$. If $\left|\overline{a}\right|=3,\left|\overline{b}\right|=4,\left|\overline{c}\right|=2$, then $\overline{a}\mathit{.}\overline{b}\mathit{+}\overline{b}\mathit{.}\overline{c}\mathit{+}\overline{c}\mathit{.}\overline{a}\mathit{+}\mathit{2}\mathit{(}\left|\overline{a}\right|\mathit{+}\left|\overline{b}\right|\mathit{+}\left|\overline{c}\right|\mathit{)}$ is equal to