Simplify : $\large\frac{6}{7}$$-2 +\large\frac{-7}{9}+\frac{19}{21}$

Question

$\begin{array}{1 1} \large\frac{33}{40} \\\large\frac{-33}{40} \\\large\frac{-64}{63} \\\large\frac{-60}{63} \end{array} $