Math Problem Solver

simplify: \hspace{.08cm}\left[\frac{2}{21}-\left\{\frac{11}{12}-\left(\frac{1}{6}\hspace{.08cm}\times\hspace{.08cm}\frac{2}{7}\right)\hspace{.08cm}\div\hspace{.08cm}\frac{1}{2}\right\}\right]+\left(2-\frac{2}{3}\right)\hspace{.08cm}