$2\sqrt{ 3 }-\frac{ 2 }{ 3 } \times \sqrt{ 27 }-\frac{ 1 }{ 2 } \times \sqrt{ 12 }$
Simplify the radical expression$2\sqrt{ 3 }-2\sqrt{ 3 }-\frac{ 1 }{ 2 } \times \sqrt{ 12 }$
Simplify the radical expression$2\sqrt{ 3 }-2\sqrt{ 3 }-\sqrt{ 3 }$
Since two opposites add up to $0$, remove them from the expression$\begin{align*}&-\sqrt{ 3 } \\&\approx-1.73205\end{align*}$